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Finding the Fourth Proportional to 539.13, 741.90 and 521.31

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Solution

The fourth proportional to 539.13, 741.90 and 521.31 is: 717.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    539.13 : 741.90 = 521.31 : x
  2. Step 2: Convert to fraction form
    539.13/741.90 = 521.31/x
  3. Step 3: Cross multiply
    539.13x = 741.90 × 521.31
  4. Step 4: Simplify right side
    539.13x = 386,759.89
  5. Step 5: Solve for x
    x = 386,759.89/539.13
  6. Step 6: Final answer
    x = 717.38

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.