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Finding the Fourth Proportional to 79.93, 119.79 and 71.76

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Solution

The fourth proportional to 79.93, 119.79 and 71.76 is: 107.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.93 : 119.79 = 71.76 : x
  2. Step 2: Convert to fraction form
    79.93/119.79 = 71.76/x
  3. Step 3: Cross multiply
    79.93x = 119.79 × 71.76
  4. Step 4: Simplify right side
    79.93x = 8,596.13
  5. Step 5: Solve for x
    x = 8,596.13/79.93
  6. Step 6: Final answer
    x = 107.55

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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.