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Finding the Fourth Proportional to 79.09, 118.63 and 42.61

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Solution

The fourth proportional to 79.09, 118.63 and 42.61 is: 63.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.09 : 118.63 = 42.61 : x
  2. Step 2: Convert to fraction form
    79.09/118.63 = 42.61/x
  3. Step 3: Cross multiply
    79.09x = 118.63 × 42.61
  4. Step 4: Simplify right side
    79.09x = 5,054.23
  5. Step 5: Solve for x
    x = 5,054.23/79.09
  6. Step 6: Final answer
    x = 63.90

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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.