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Finding the Fourth Proportional to 280.61, 387.25 and 156.29

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Solution

The fourth proportional to 280.61, 387.25 and 156.29 is: 215.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.61 : 387.25 = 156.29 : x
  2. Step 2: Convert to fraction form
    280.61/387.25 = 156.29/x
  3. Step 3: Cross multiply
    280.61x = 387.25 × 156.29
  4. Step 4: Simplify right side
    280.61x = 60,523.30
  5. Step 5: Solve for x
    x = 60,523.30/280.61
  6. Step 6: Final answer
    x = 215.68

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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.