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Finding the Fourth Proportional to 1,125.28, 1,553.12 and 916.80

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Solution

The fourth proportional to 1,125.28, 1,553.12 and 916.80 is: 1,265.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,125.28 : 1,553.12 = 916.80 : x
  2. Step 2: Convert to fraction form
    1,125.28/1,553.12 = 916.80/x
  3. Step 3: Cross multiply
    1,125.28x = 1,553.12 × 916.80
  4. Step 4: Simplify right side
    1,125.28x = 1,423,900.42
  5. Step 5: Solve for x
    x = 1,423,900.42/1,125.28
  6. Step 6: Final answer
    x = 1,265.37

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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.