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Finding the Fourth Proportional to 144.33, 216.57 and 72.20

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Solution

The fourth proportional to 144.33, 216.57 and 72.20 is: 108.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    144.33 : 216.57 = 72.20 : x
  2. Step 2: Convert to fraction form
    144.33/216.57 = 72.20/x
  3. Step 3: Cross multiply
    144.33x = 216.57 × 72.20
  4. Step 4: Simplify right side
    144.33x = 15,635.27
  5. Step 5: Solve for x
    x = 15,635.27/144.33
  6. Step 6: Final answer
    x = 108.33

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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.