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Finding the Fourth Proportional to 124.87, 187.29 and 84.55

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Solution

The fourth proportional to 124.87, 187.29 and 84.55 is: 126.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.87 : 187.29 = 84.55 : x
  2. Step 2: Convert to fraction form
    124.87/187.29 = 84.55/x
  3. Step 3: Cross multiply
    124.87x = 187.29 × 84.55
  4. Step 4: Simplify right side
    124.87x = 15,835.37
  5. Step 5: Solve for x
    x = 15,835.37/124.87
  6. Step 6: Final answer
    x = 126.81

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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.