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Finding the Fourth Proportional to 1,013.52, 1,517.40 and 915.12

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Solution

The fourth proportional to 1,013.52, 1,517.40 and 915.12 is: 1,370.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,013.52 : 1,517.40 = 915.12 : x
  2. Step 2: Convert to fraction form
    1,013.52/1,517.40 = 915.12/x
  3. Step 3: Cross multiply
    1,013.52x = 1,517.40 × 915.12
  4. Step 4: Simplify right side
    1,013.52x = 1,388,603.09
  5. Step 5: Solve for x
    x = 1,388,603.09/1,013.52
  6. Step 6: Final answer
    x = 1,370.08

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.