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Finding the Fourth Proportional to 67.41, 99.99 and 66.60

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Solution

The fourth proportional to 67.41, 99.99 and 66.60 is: 98.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    67.41 : 99.99 = 66.60 : x
  2. Step 2: Convert to fraction form
    67.41/99.99 = 66.60/x
  3. Step 3: Cross multiply
    67.41x = 99.99 × 66.60
  4. Step 4: Simplify right side
    67.41x = 6,659.33
  5. Step 5: Solve for x
    x = 6,659.33/67.41
  6. Step 6: Final answer
    x = 98.79

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Why These Related Problems?

These problems maintain the same ratio (1.48) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.