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Finding the Fourth Proportional to 576,427.20, 864,640.80 and 399,280.20

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Solution

The fourth proportional to 576,427.20, 864,640.80 and 399,280.20 is: 598,920.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    576,427.20 : 864,640.80 = 399,280.20 : x
  2. Step 2: Convert to fraction form
    576,427.20/864,640.80 = 399,280.20/x
  3. Step 3: Cross multiply
    576,427.20x = 864,640.80 × 399,280.20
  4. Step 4: Simplify right side
    576,427.20x = 345,233,951,552.16
  5. Step 5: Solve for x
    x = 345,233,951,552.16/576,427.20
  6. Step 6: Final answer
    x = 598,920.30

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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.