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Finding the Fourth Proportional to 98.80, 136.05 and 67.68

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Solution

The fourth proportional to 98.80, 136.05 and 67.68 is: 93.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.80 : 136.05 = 67.68 : x
  2. Step 2: Convert to fraction form
    98.80/136.05 = 67.68/x
  3. Step 3: Cross multiply
    98.80x = 136.05 × 67.68
  4. Step 4: Simplify right side
    98.80x = 9,208.37
  5. Step 5: Solve for x
    x = 9,208.37/98.80
  6. Step 6: Final answer
    x = 93.20

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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.