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Finding the Fourth Proportional to 144.65, 199.61 and 79.15

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Solution

The fourth proportional to 144.65, 199.61 and 79.15 is: 109.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    144.65 : 199.61 = 79.15 : x
  2. Step 2: Convert to fraction form
    144.65/199.61 = 79.15/x
  3. Step 3: Cross multiply
    144.65x = 199.61 × 79.15
  4. Step 4: Simplify right side
    144.65x = 15,799.13
  5. Step 5: Solve for x
    x = 15,799.13/144.65
  6. Step 6: Final answer
    x = 109.22

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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.