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Finding the Fourth Proportional to 938.36, 1,407.53 and 915.11

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Solution

The fourth proportional to 938.36, 1,407.53 and 915.11 is: 1,372.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    938.36 : 1,407.53 = 915.11 : x
  2. Step 2: Convert to fraction form
    938.36/1,407.53 = 915.11/x
  3. Step 3: Cross multiply
    938.36x = 1,407.53 × 915.11
  4. Step 4: Simplify right side
    938.36x = 1,288,044.78
  5. Step 5: Solve for x
    x = 1,288,044.78/938.36
  6. Step 6: Final answer
    x = 1,372.66

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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.