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Finding the Fourth Proportional to 717.32, 990.12 and 484.40

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Solution

The fourth proportional to 717.32, 990.12 and 484.40 is: 668.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.32 : 990.12 = 484.40 : x
  2. Step 2: Convert to fraction form
    717.32/990.12 = 484.40/x
  3. Step 3: Cross multiply
    717.32x = 990.12 × 484.40
  4. Step 4: Simplify right side
    717.32x = 479,614.13
  5. Step 5: Solve for x
    x = 479,614.13/717.32
  6. Step 6: Final answer
    x = 668.62

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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.