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Finding the Fourth Proportional to 79.67, 109.72 and 74.34

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Solution

The fourth proportional to 79.67, 109.72 and 74.34 is: 102.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.67 : 109.72 = 74.34 : x
  2. Step 2: Convert to fraction form
    79.67/109.72 = 74.34/x
  3. Step 3: Cross multiply
    79.67x = 109.72 × 74.34
  4. Step 4: Simplify right side
    79.67x = 8,156.58
  5. Step 5: Solve for x
    x = 8,156.58/79.67
  6. Step 6: Final answer
    x = 102.38

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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.