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Finding the Fourth Proportional to 915.47, 1,263.20 and 517.15

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Solution

The fourth proportional to 915.47, 1,263.20 and 517.15 is: 713.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.47 : 1,263.20 = 517.15 : x
  2. Step 2: Convert to fraction form
    915.47/1,263.20 = 517.15/x
  3. Step 3: Cross multiply
    915.47x = 1,263.20 × 517.15
  4. Step 4: Simplify right side
    915.47x = 653,262.87
  5. Step 5: Solve for x
    x = 653,262.87/915.47
  6. Step 6: Final answer
    x = 713.58

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Double scale
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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.