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Finding the Fourth Proportional to 99.80, 149.37 and 72.30

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Solution

The fourth proportional to 99.80, 149.37 and 72.30 is: 108.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.80 : 149.37 = 72.30 : x
  2. Step 2: Convert to fraction form
    99.80/149.37 = 72.30/x
  3. Step 3: Cross multiply
    99.80x = 149.37 × 72.30
  4. Step 4: Simplify right side
    99.80x = 10,799.45
  5. Step 5: Solve for x
    x = 10,799.45/99.80
  6. Step 6: Final answer
    x = 108.21

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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.