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Finding the Fourth Proportional to 578,643.40, 867,965.10 and 368,432.20

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Solution

The fourth proportional to 578,643.40, 867,965.10 and 368,432.20 is: 552,648.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    578,643.40 : 867,965.10 = 368,432.20 : x
  2. Step 2: Convert to fraction form
    578,643.40/867,965.10 = 368,432.20/x
  3. Step 3: Cross multiply
    578,643.40x = 867,965.10 × 368,432.20
  4. Step 4: Simplify right side
    578,643.40x = 319,786,291,316.22
  5. Step 5: Solve for x
    x = 319,786,291,316.22/578,643.40
  6. Step 6: Final answer
    x = 552,648.30

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.