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Finding the Fourth Proportional to 1,242.68, 1,865.11 and 658.10

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Solution

The fourth proportional to 1,242.68, 1,865.11 and 658.10 is: 987.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,242.68 : 1,865.11 = 658.10 : x
  2. Step 2: Convert to fraction form
    1,242.68/1,865.11 = 658.10/x
  3. Step 3: Cross multiply
    1,242.68x = 1,865.11 × 658.10
  4. Step 4: Simplify right side
    1,242.68x = 1,227,431.29
  5. Step 5: Solve for x
    x = 1,227,431.29/1,242.68
  6. Step 6: Final answer
    x = 987.73

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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.