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Finding the Fourth Proportional to 125.15, 186.80 and 108.86

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Solution

The fourth proportional to 125.15, 186.80 and 108.86 is: 162.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    125.15 : 186.80 = 108.86 : x
  2. Step 2: Convert to fraction form
    125.15/186.80 = 108.86/x
  3. Step 3: Cross multiply
    125.15x = 186.80 × 108.86
  4. Step 4: Simplify right side
    125.15x = 20,333.57
  5. Step 5: Solve for x
    x = 20,333.57/125.15
  6. Step 6: Final answer
    x = 162.48

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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.