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Finding the Fourth Proportional to 79.10, 108.96 and 66.81

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Solution

The fourth proportional to 79.10, 108.96 and 66.81 is: 92.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.10 : 108.96 = 66.81 : x
  2. Step 2: Convert to fraction form
    79.10/108.96 = 66.81/x
  3. Step 3: Cross multiply
    79.10x = 108.96 × 66.81
  4. Step 4: Simplify right side
    79.10x = 7,279.62
  5. Step 5: Solve for x
    x = 7,279.62/79.10
  6. Step 6: Final answer
    x = 92.03

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.