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Finding the Fourth Proportional to 72.43, 108.80 and 71.28

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Solution

The fourth proportional to 72.43, 108.80 and 71.28 is: 107.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.43 : 108.80 = 71.28 : x
  2. Step 2: Convert to fraction form
    72.43/108.80 = 71.28/x
  3. Step 3: Cross multiply
    72.43x = 108.80 × 71.28
  4. Step 4: Simplify right side
    72.43x = 7,755.17
  5. Step 5: Solve for x
    x = 7,755.17/72.43
  6. Step 6: Final answer
    x = 107.08

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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.