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Finding the Fourth Proportional to 438,657.40, 657,986.10 and 261,710.20

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Solution

The fourth proportional to 438,657.40, 657,986.10 and 261,710.20 is: 392,565.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    438,657.40 : 657,986.10 = 261,710.20 : x
  2. Step 2: Convert to fraction form
    438,657.40/657,986.10 = 261,710.20/x
  3. Step 3: Cross multiply
    438,657.40x = 657,986.10 × 261,710.20
  4. Step 4: Simplify right side
    438,657.40x = 172,201,673,828.22
  5. Step 5: Solve for x
    x = 172,201,673,828.22/438,657.40
  6. Step 6: Final answer
    x = 392,565.30

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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.