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Finding the Fourth Proportional to 1,080.38, 1,489.92 and 748.28

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Solution

The fourth proportional to 1,080.38, 1,489.92 and 748.28 is: 1,031.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,080.38 : 1,489.92 = 748.28 : x
  2. Step 2: Convert to fraction form
    1,080.38/1,489.92 = 748.28/x
  3. Step 3: Cross multiply
    1,080.38x = 1,489.92 × 748.28
  4. Step 4: Simplify right side
    1,080.38x = 1,114,877.34
  5. Step 5: Solve for x
    x = 1,114,877.34/1,080.38
  6. Step 6: Final answer
    x = 1,031.93

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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.