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Finding the Fourth Proportional to 1,142.28, 1,575.84 and 676.24

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Solution

The fourth proportional to 1,142.28, 1,575.84 and 676.24 is: 932.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,142.28 : 1,575.84 = 676.24 : x
  2. Step 2: Convert to fraction form
    1,142.28/1,575.84 = 676.24/x
  3. Step 3: Cross multiply
    1,142.28x = 1,575.84 × 676.24
  4. Step 4: Simplify right side
    1,142.28x = 1,065,646.04
  5. Step 5: Solve for x
    x = 1,065,646.04/1,142.28
  6. Step 6: Final answer
    x = 932.91

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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.