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Finding the Fourth Proportional to 124.10, 186 and 85.52

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Solution

The fourth proportional to 124.10, 186 and 85.52 is: 128.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.10 : 186 = 85.52 : x
  2. Step 2: Convert to fraction form
    124.10/186 = 85.52/x
  3. Step 3: Cross multiply
    124.10x = 186 × 85.52
  4. Step 4: Simplify right side
    124.10x = 15,906.72
  5. Step 5: Solve for x
    x = 15,906.72/124.10
  6. Step 6: Final answer
    x = 128.18

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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.