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Finding the Fourth Proportional to 72.64, 108.36 and 67.24

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Solution

The fourth proportional to 72.64, 108.36 and 67.24 is: 100.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.64 : 108.36 = 67.24 : x
  2. Step 2: Convert to fraction form
    72.64/108.36 = 67.24/x
  3. Step 3: Cross multiply
    72.64x = 108.36 × 67.24
  4. Step 4: Simplify right side
    72.64x = 7,286.13
  5. Step 5: Solve for x
    x = 7,286.13/72.64
  6. Step 6: Final answer
    x = 100.30

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.