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Finding the Fourth Proportional to 125.79, 173.57 and 81.55

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Solution

The fourth proportional to 125.79, 173.57 and 81.55 is: 112.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    125.79 : 173.57 = 81.55 : x
  2. Step 2: Convert to fraction form
    125.79/173.57 = 81.55/x
  3. Step 3: Cross multiply
    125.79x = 173.57 × 81.55
  4. Step 4: Simplify right side
    125.79x = 14,154.23
  5. Step 5: Solve for x
    x = 14,154.23/125.79
  6. Step 6: Final answer
    x = 112.53

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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.