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Finding the Fourth Proportional to 717.28, 989.86 and 402.61

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Solution

The fourth proportional to 717.28, 989.86 and 402.61 is: 555.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.28 : 989.86 = 402.61 : x
  2. Step 2: Convert to fraction form
    717.28/989.86 = 402.61/x
  3. Step 3: Cross multiply
    717.28x = 989.86 × 402.61
  4. Step 4: Simplify right side
    717.28x = 398,527.53
  5. Step 5: Solve for x
    x = 398,527.53/717.28
  6. Step 6: Final answer
    x = 555.61

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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.