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Finding the Fourth Proportional to 1,239.72, 1,711.56 and 866.04

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Solution

The fourth proportional to 1,239.72, 1,711.56 and 866.04 is: 1,195.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,239.72 : 1,711.56 = 866.04 : x
  2. Step 2: Convert to fraction form
    1,239.72/1,711.56 = 866.04/x
  3. Step 3: Cross multiply
    1,239.72x = 1,711.56 × 866.04
  4. Step 4: Simplify right side
    1,239.72x = 1,482,279.42
  5. Step 5: Solve for x
    x = 1,482,279.42/1,239.72
  6. Step 6: Final answer
    x = 1,195.66

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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.