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Finding the Fourth Proportional to 73.08, 100.22 and 72.90

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Solution

The fourth proportional to 73.08, 100.22 and 72.90 is: 99.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    73.08 : 100.22 = 72.90 : x
  2. Step 2: Convert to fraction form
    73.08/100.22 = 72.90/x
  3. Step 3: Cross multiply
    73.08x = 100.22 × 72.90
  4. Step 4: Simplify right side
    73.08x = 7,305.67
  5. Step 5: Solve for x
    x = 7,305.67/73.08
  6. Step 6: Final answer
    x = 99.97

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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.