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Finding the Fourth Proportional to 72.20, 99.03 and 68.28

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Solution

The fourth proportional to 72.20, 99.03 and 68.28 is: 93.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.20 : 99.03 = 68.28 : x
  2. Step 2: Convert to fraction form
    72.20/99.03 = 68.28/x
  3. Step 3: Cross multiply
    72.20x = 99.03 × 68.28
  4. Step 4: Simplify right side
    72.20x = 6,761.43
  5. Step 5: Solve for x
    x = 6,761.43/72.20
  6. Step 6: Final answer
    x = 93.65

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.