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Finding the Fourth Proportional to 717.11, 990.71 and 613.28

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Solution

The fourth proportional to 717.11, 990.71 and 613.28 is: 847.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.11 : 990.71 = 613.28 : x
  2. Step 2: Convert to fraction form
    717.11/990.71 = 613.28/x
  3. Step 3: Cross multiply
    717.11x = 990.71 × 613.28
  4. Step 4: Simplify right side
    717.11x = 607,574.61
  5. Step 5: Solve for x
    x = 607,574.61/717.11
  6. Step 6: Final answer
    x = 847.26

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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.