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Finding the Fourth Proportional to 125.36, 173.01 and 78.76

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Solution

The fourth proportional to 125.36, 173.01 and 78.76 is: 108.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    125.36 : 173.01 = 78.76 : x
  2. Step 2: Convert to fraction form
    125.36/173.01 = 78.76/x
  3. Step 3: Cross multiply
    125.36x = 173.01 × 78.76
  4. Step 4: Simplify right side
    125.36x = 13,626.27
  5. Step 5: Solve for x
    x = 13,626.27/125.36
  6. Step 6: Final answer
    x = 108.70

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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.