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Finding the Fourth Proportional to 125.89, 173.72 and 78.61

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Solution

The fourth proportional to 125.89, 173.72 and 78.61 is: 108.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    125.89 : 173.72 = 78.61 : x
  2. Step 2: Convert to fraction form
    125.89/173.72 = 78.61/x
  3. Step 3: Cross multiply
    125.89x = 173.72 × 78.61
  4. Step 4: Simplify right side
    125.89x = 13,656.13
  5. Step 5: Solve for x
    x = 13,656.13/125.89
  6. Step 6: Final answer
    x = 108.48

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.