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Finding the Fourth Proportional to 125.28, 187.65 and 84.60

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Solution

The fourth proportional to 125.28, 187.65 and 84.60 is: 126.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    125.28 : 187.65 = 84.60 : x
  2. Step 2: Convert to fraction form
    125.28/187.65 = 84.60/x
  3. Step 3: Cross multiply
    125.28x = 187.65 × 84.60
  4. Step 4: Simplify right side
    125.28x = 15,875.19
  5. Step 5: Solve for x
    x = 15,875.19/125.28
  6. Step 6: Final answer
    x = 126.72

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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.