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Finding the Fourth Proportional to 1,123.72, 1,687.28 and 916.12

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Solution

The fourth proportional to 1,123.72, 1,687.28 and 916.12 is: 1,375.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,123.72 : 1,687.28 = 916.12 : x
  2. Step 2: Convert to fraction form
    1,123.72/1,687.28 = 916.12/x
  3. Step 3: Cross multiply
    1,123.72x = 1,687.28 × 916.12
  4. Step 4: Simplify right side
    1,123.72x = 1,545,750.95
  5. Step 5: Solve for x
    x = 1,545,750.95/1,123.72
  6. Step 6: Final answer
    x = 1,375.57

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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.