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Finding the Fourth Proportional to 73.20, 100.86 and 72.30

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Solution

The fourth proportional to 73.20, 100.86 and 72.30 is: 99.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    73.20 : 100.86 = 72.30 : x
  2. Step 2: Convert to fraction form
    73.20/100.86 = 72.30/x
  3. Step 3: Cross multiply
    73.20x = 100.86 × 72.30
  4. Step 4: Simplify right side
    73.20x = 7,292.18
  5. Step 5: Solve for x
    x = 7,292.18/73.20
  6. Step 6: Final answer
    x = 99.62

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.