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Finding the Fourth Proportional to 99.68, 149.30 and 80.37

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Solution

The fourth proportional to 99.68, 149.30 and 80.37 is: 120.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.68 : 149.30 = 80.37 : x
  2. Step 2: Convert to fraction form
    99.68/149.30 = 80.37/x
  3. Step 3: Cross multiply
    99.68x = 149.30 × 80.37
  4. Step 4: Simplify right side
    99.68x = 11,998.84
  5. Step 5: Solve for x
    x = 11,998.84/99.68
  6. Step 6: Final answer
    x = 120.37

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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.