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Finding the Fourth Proportional to 758.76, 1,138.23 and 271.86

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Solution

The fourth proportional to 758.76, 1,138.23 and 271.86 is: 407.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    758.76 : 1,138.23 = 271.86 : x
  2. Step 2: Convert to fraction form
    758.76/1,138.23 = 271.86/x
  3. Step 3: Cross multiply
    758.76x = 1,138.23 × 271.86
  4. Step 4: Simplify right side
    758.76x = 309,439.21
  5. Step 5: Solve for x
    x = 309,439.21/758.76
  6. Step 6: Final answer
    x = 407.82

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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.