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Finding the Fourth Proportional to 79.90, 119.91 and 60.66

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Solution

The fourth proportional to 79.90, 119.91 and 60.66 is: 91.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.90 : 119.91 = 60.66 : x
  2. Step 2: Convert to fraction form
    79.90/119.91 = 60.66/x
  3. Step 3: Cross multiply
    79.90x = 119.91 × 60.66
  4. Step 4: Simplify right side
    79.90x = 7,273.74
  5. Step 5: Solve for x
    x = 7,273.74/79.90
  6. Step 6: Final answer
    x = 91.04

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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.