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Finding the Fourth Proportional to 1,127.32, 1,555.98 and 729.42

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Solution

The fourth proportional to 1,127.32, 1,555.98 and 729.42 is: 1,006.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,127.32 : 1,555.98 = 729.42 : x
  2. Step 2: Convert to fraction form
    1,127.32/1,555.98 = 729.42/x
  3. Step 3: Cross multiply
    1,127.32x = 1,555.98 × 729.42
  4. Step 4: Simplify right side
    1,127.32x = 1,134,963.11
  5. Step 5: Solve for x
    x = 1,134,963.11/1,127.32
  6. Step 6: Final answer
    x = 1,006.78

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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.