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Finding the Fourth Proportional to 1,127.74, 1,691.79 and 511.42

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Solution

The fourth proportional to 1,127.74, 1,691.79 and 511.42 is: 767.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,127.74 : 1,691.79 = 511.42 : x
  2. Step 2: Convert to fraction form
    1,127.74/1,691.79 = 511.42/x
  3. Step 3: Cross multiply
    1,127.74x = 1,691.79 × 511.42
  4. Step 4: Simplify right side
    1,127.74x = 865,215.24
  5. Step 5: Solve for x
    x = 865,215.24/1,127.74
  6. Step 6: Final answer
    x = 767.21

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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.