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Finding the Fourth Proportional to 144.64, 216.96 and 72.48

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Solution

The fourth proportional to 144.64, 216.96 and 72.48 is: 108.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    144.64 : 216.96 = 72.48 : x
  2. Step 2: Convert to fraction form
    144.64/216.96 = 72.48/x
  3. Step 3: Cross multiply
    144.64x = 216.96 × 72.48
  4. Step 4: Simplify right side
    144.64x = 15,725.26
  5. Step 5: Solve for x
    x = 15,725.26/144.64
  6. Step 6: Final answer
    x = 108.72

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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.