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Finding the Fourth Proportional to 1,125.28, 1,687.92 and 547.48

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Solution

The fourth proportional to 1,125.28, 1,687.92 and 547.48 is: 821.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,125.28 : 1,687.92 = 547.48 : x
  2. Step 2: Convert to fraction form
    1,125.28/1,687.92 = 547.48/x
  3. Step 3: Cross multiply
    1,125.28x = 1,687.92 × 547.48
  4. Step 4: Simplify right side
    1,125.28x = 924,102.44
  5. Step 5: Solve for x
    x = 924,102.44/1,125.28
  6. Step 6: Final answer
    x = 821.22

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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.