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Finding the Fourth Proportional to 79.26, 108.87 and 66.30

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Solution

The fourth proportional to 79.26, 108.87 and 66.30 is: 91.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.26 : 108.87 = 66.30 : x
  2. Step 2: Convert to fraction form
    79.26/108.87 = 66.30/x
  3. Step 3: Cross multiply
    79.26x = 108.87 × 66.30
  4. Step 4: Simplify right side
    79.26x = 7,218.08
  5. Step 5: Solve for x
    x = 7,218.08/79.26
  6. Step 6: Final answer
    x = 91.07

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.