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Finding the Fourth Proportional to 758.78, 1,138.24 and 238.79

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Solution

The fourth proportional to 758.78, 1,138.24 and 238.79 is: 358.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    758.78 : 1,138.24 = 238.79 : x
  2. Step 2: Convert to fraction form
    758.78/1,138.24 = 238.79/x
  3. Step 3: Cross multiply
    758.78x = 1,138.24 × 238.79
  4. Step 4: Simplify right side
    758.78x = 271,803.77
  5. Step 5: Solve for x
    x = 271,803.77/758.78
  6. Step 6: Final answer
    x = 358.21

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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.