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Finding the Fourth Proportional to 91.62, 137.16 and 79.65

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Solution

The fourth proportional to 91.62, 137.16 and 79.65 is: 119.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.62 : 137.16 = 79.65 : x
  2. Step 2: Convert to fraction form
    91.62/137.16 = 79.65/x
  3. Step 3: Cross multiply
    91.62x = 137.16 × 79.65
  4. Step 4: Simplify right side
    91.62x = 10,924.79
  5. Step 5: Solve for x
    x = 10,924.79/91.62
  6. Step 6: Final answer
    x = 119.24

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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.