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Finding the Fourth Proportional to 79.12, 118.68 and 40.60

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Solution

The fourth proportional to 79.12, 118.68 and 40.60 is: 60.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.12 : 118.68 = 40.60 : x
  2. Step 2: Convert to fraction form
    79.12/118.68 = 40.60/x
  3. Step 3: Cross multiply
    79.12x = 118.68 × 40.60
  4. Step 4: Simplify right side
    79.12x = 4,818.41
  5. Step 5: Solve for x
    x = 4,818.41/79.12
  6. Step 6: Final answer
    x = 60.90

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.