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Finding the Fourth Proportional to 124.80, 186.56 and 113.92

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Solution

The fourth proportional to 124.80, 186.56 and 113.92 is: 170.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.80 : 186.56 = 113.92 : x
  2. Step 2: Convert to fraction form
    124.80/186.56 = 113.92/x
  3. Step 3: Cross multiply
    124.80x = 186.56 × 113.92
  4. Step 4: Simplify right side
    124.80x = 21,252.92
  5. Step 5: Solve for x
    x = 21,252.92/124.80
  6. Step 6: Final answer
    x = 170.30

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.