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Finding the Fourth Proportional to 955.28, 1,431.56 and 748.92

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Solution

The fourth proportional to 955.28, 1,431.56 and 748.92 is: 1,122.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    955.28 : 1,431.56 = 748.92 : x
  2. Step 2: Convert to fraction form
    955.28/1,431.56 = 748.92/x
  3. Step 3: Cross multiply
    955.28x = 1,431.56 × 748.92
  4. Step 4: Simplify right side
    955.28x = 1,072,123.92
  5. Step 5: Solve for x
    x = 1,072,123.92/955.28
  6. Step 6: Final answer
    x = 1,122.31

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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.