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Finding the Fourth Proportional to 758.76, 1,138.36 and 271.85

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Solution

The fourth proportional to 758.76, 1,138.36 and 271.85 is: 407.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    758.76 : 1,138.36 = 271.85 : x
  2. Step 2: Convert to fraction form
    758.76/1,138.36 = 271.85/x
  3. Step 3: Cross multiply
    758.76x = 1,138.36 × 271.85
  4. Step 4: Simplify right side
    758.76x = 309,456.79
  5. Step 5: Solve for x
    x = 309,456.79/758.76
  6. Step 6: Final answer
    x = 407.85

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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.