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Finding the Fourth Proportional to 758.71, 1,138.09 and 238.69

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Solution

The fourth proportional to 758.71, 1,138.09 and 238.69 is: 358.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    758.71 : 1,138.09 = 238.69 : x
  2. Step 2: Convert to fraction form
    758.71/1,138.09 = 238.69/x
  3. Step 3: Cross multiply
    758.71x = 1,138.09 × 238.69
  4. Step 4: Simplify right side
    758.71x = 271,650.70
  5. Step 5: Solve for x
    x = 271,650.70/758.71
  6. Step 6: Final answer
    x = 358.04

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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.