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Finding the Fourth Proportional to 115.78, 173.50 and 79.18

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Solution

The fourth proportional to 115.78, 173.50 and 79.18 is: 118.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.78 : 173.50 = 79.18 : x
  2. Step 2: Convert to fraction form
    115.78/173.50 = 79.18/x
  3. Step 3: Cross multiply
    115.78x = 173.50 × 79.18
  4. Step 4: Simplify right side
    115.78x = 13,737.73
  5. Step 5: Solve for x
    x = 13,737.73/115.78
  6. Step 6: Final answer
    x = 118.65

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.