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Finding the Fourth Proportional to 717.34, 990.48 and 521.32

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Solution

The fourth proportional to 717.34, 990.48 and 521.32 is: 719.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.34 : 990.48 = 521.32 : x
  2. Step 2: Convert to fraction form
    717.34/990.48 = 521.32/x
  3. Step 3: Cross multiply
    717.34x = 990.48 × 521.32
  4. Step 4: Simplify right side
    717.34x = 516,357.03
  5. Step 5: Solve for x
    x = 516,357.03/717.34
  6. Step 6: Final answer
    x = 719.82

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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.