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Finding the Fourth Proportional to 144.22, 216.21 and 79.15

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Solution

The fourth proportional to 144.22, 216.21 and 79.15 is: 118.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    144.22 : 216.21 = 79.15 : x
  2. Step 2: Convert to fraction form
    144.22/216.21 = 79.15/x
  3. Step 3: Cross multiply
    144.22x = 216.21 × 79.15
  4. Step 4: Simplify right side
    144.22x = 17,113.02
  5. Step 5: Solve for x
    x = 17,113.02/144.22
  6. Step 6: Final answer
    x = 118.66

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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.