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Finding the Fourth Proportional to 92.65, 139.12 and 79.95

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Solution

The fourth proportional to 92.65, 139.12 and 79.95 is: 120.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.65 : 139.12 = 79.95 : x
  2. Step 2: Convert to fraction form
    92.65/139.12 = 79.95/x
  3. Step 3: Cross multiply
    92.65x = 139.12 × 79.95
  4. Step 4: Simplify right side
    92.65x = 11,122.64
  5. Step 5: Solve for x
    x = 11,122.64/92.65
  6. Step 6: Final answer
    x = 120.05

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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.