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Finding the Fourth Proportional to 280.61, 387.42 and 175.85

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Solution

The fourth proportional to 280.61, 387.42 and 175.85 is: 242.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.61 : 387.42 = 175.85 : x
  2. Step 2: Convert to fraction form
    280.61/387.42 = 175.85/x
  3. Step 3: Cross multiply
    280.61x = 387.42 × 175.85
  4. Step 4: Simplify right side
    280.61x = 68,125.87
  5. Step 5: Solve for x
    x = 68,125.87/280.61
  6. Step 6: Final answer
    x = 242.78

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.