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Finding the Fourth Proportional to 187.12, 280.78 and 89.73

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Solution

The fourth proportional to 187.12, 280.78 and 89.73 is: 134.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    187.12 : 280.78 = 89.73 : x
  2. Step 2: Convert to fraction form
    187.12/280.78 = 89.73/x
  3. Step 3: Cross multiply
    187.12x = 280.78 × 89.73
  4. Step 4: Simplify right side
    187.12x = 25,194.17
  5. Step 5: Solve for x
    x = 25,194.17/187.12
  6. Step 6: Final answer
    x = 134.64

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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.