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Finding the Fourth Proportional to 99.80, 149.49 and 65.48

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Solution

The fourth proportional to 99.80, 149.49 and 65.48 is: 98.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.80 : 149.49 = 65.48 : x
  2. Step 2: Convert to fraction form
    99.80/149.49 = 65.48/x
  3. Step 3: Cross multiply
    99.80x = 149.49 × 65.48
  4. Step 4: Simplify right side
    99.80x = 9,787.86
  5. Step 5: Solve for x
    x = 9,787.86/99.80
  6. Step 6: Final answer
    x = 98.08

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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.