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Finding the Fourth Proportional to 144.29, 216.45 and 72.20

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Solution

The fourth proportional to 144.29, 216.45 and 72.20 is: 108.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    144.29 : 216.45 = 72.20 : x
  2. Step 2: Convert to fraction form
    144.29/216.45 = 72.20/x
  3. Step 3: Cross multiply
    144.29x = 216.45 × 72.20
  4. Step 4: Simplify right side
    144.29x = 15,626.61
  5. Step 5: Solve for x
    x = 15,626.61/144.29
  6. Step 6: Final answer
    x = 108.30

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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.