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Finding the Fourth Proportional to 79.18, 109.34 and 58.57

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Solution

The fourth proportional to 79.18, 109.34 and 58.57 is: 80.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.18 : 109.34 = 58.57 : x
  2. Step 2: Convert to fraction form
    79.18/109.34 = 58.57/x
  3. Step 3: Cross multiply
    79.18x = 109.34 × 58.57
  4. Step 4: Simplify right side
    79.18x = 6,404.04
  5. Step 5: Solve for x
    x = 6,404.04/79.18
  6. Step 6: Final answer
    x = 80.88

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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.