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Finding the Fourth Proportional to 187.32, 280.60 and 138.72

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Solution

The fourth proportional to 187.32, 280.60 and 138.72 is: 207.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    187.32 : 280.60 = 138.72 : x
  2. Step 2: Convert to fraction form
    187.32/280.60 = 138.72/x
  3. Step 3: Cross multiply
    187.32x = 280.60 × 138.72
  4. Step 4: Simplify right side
    187.32x = 38,923.43
  5. Step 5: Solve for x
    x = 38,923.43/187.32
  6. Step 6: Final answer
    x = 207.79

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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.