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Finding the Fourth Proportional to 79.07, 109.10 and 66.92

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Solution

The fourth proportional to 79.07, 109.10 and 66.92 is: 92.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.07 : 109.10 = 66.92 : x
  2. Step 2: Convert to fraction form
    79.07/109.10 = 66.92/x
  3. Step 3: Cross multiply
    79.07x = 109.10 × 66.92
  4. Step 4: Simplify right side
    79.07x = 7,300.64
  5. Step 5: Solve for x
    x = 7,300.64/79.07
  6. Step 6: Final answer
    x = 92.33

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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.