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Finding the Fourth Proportional to 915.53, 1,263.40 and 517.20

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Solution

The fourth proportional to 915.53, 1,263.40 and 517.20 is: 713.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.53 : 1,263.40 = 517.20 : x
  2. Step 2: Convert to fraction form
    915.53/1,263.40 = 517.20/x
  3. Step 3: Cross multiply
    915.53x = 1,263.40 × 517.20
  4. Step 4: Simplify right side
    915.53x = 653,435.11
  5. Step 5: Solve for x
    x = 653,435.11/915.53
  6. Step 6: Final answer
    x = 713.73

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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.