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Finding the Fourth Proportional to 79.15, 118.74 and 40.65

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Solution

The fourth proportional to 79.15, 118.74 and 40.65 is: 60.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.15 : 118.74 = 40.65 : x
  2. Step 2: Convert to fraction form
    79.15/118.74 = 40.65/x
  3. Step 3: Cross multiply
    79.15x = 118.74 × 40.65
  4. Step 4: Simplify right side
    79.15x = 4,826.78
  5. Step 5: Solve for x
    x = 4,826.78/79.15
  6. Step 6: Final answer
    x = 60.98

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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.