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Finding the Fourth Proportional to 915.57, 1,263.39 and 517.17

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Solution

The fourth proportional to 915.57, 1,263.39 and 517.17 is: 713.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.57 : 1,263.39 = 517.17 : x
  2. Step 2: Convert to fraction form
    915.57/1,263.39 = 517.17/x
  3. Step 3: Cross multiply
    915.57x = 1,263.39 × 517.17
  4. Step 4: Simplify right side
    915.57x = 653,387.41
  5. Step 5: Solve for x
    x = 653,387.41/915.57
  6. Step 6: Final answer
    x = 713.64

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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.