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Finding the Fourth Proportional to 187.60, 281.52 and 84.90

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Solution

The fourth proportional to 187.60, 281.52 and 84.90 is: 127.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    187.60 : 281.52 = 84.90 : x
  2. Step 2: Convert to fraction form
    187.60/281.52 = 84.90/x
  3. Step 3: Cross multiply
    187.60x = 281.52 × 84.90
  4. Step 4: Simplify right side
    187.60x = 23,901.05
  5. Step 5: Solve for x
    x = 23,901.05/187.60
  6. Step 6: Final answer
    x = 127.40

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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.