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Finding the Fourth Proportional to 144.66, 216.90 and 79.69

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Solution

The fourth proportional to 144.66, 216.90 and 79.69 is: 119.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    144.66 : 216.90 = 79.69 : x
  2. Step 2: Convert to fraction form
    144.66/216.90 = 79.69/x
  3. Step 3: Cross multiply
    144.66x = 216.90 × 79.69
  4. Step 4: Simplify right side
    144.66x = 17,284.87
  5. Step 5: Solve for x
    x = 17,284.87/144.66
  6. Step 6: Final answer
    x = 119.49

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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.