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Finding the Fourth Proportional to 79.42, 109.01 and 76.08

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Solution

The fourth proportional to 79.42, 109.01 and 76.08 is: 104.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.42 : 109.01 = 76.08 : x
  2. Step 2: Convert to fraction form
    79.42/109.01 = 76.08/x
  3. Step 3: Cross multiply
    79.42x = 109.01 × 76.08
  4. Step 4: Simplify right side
    79.42x = 8,293.48
  5. Step 5: Solve for x
    x = 8,293.48/79.42
  6. Step 6: Final answer
    x = 104.43

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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.