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Finding the Fourth Proportional to 67.11, 99.98 and 66.84

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Solution

The fourth proportional to 67.11, 99.98 and 66.84 is: 99.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    67.11 : 99.98 = 66.84 : x
  2. Step 2: Convert to fraction form
    67.11/99.98 = 66.84/x
  3. Step 3: Cross multiply
    67.11x = 99.98 × 66.84
  4. Step 4: Simplify right side
    67.11x = 6,682.33
  5. Step 5: Solve for x
    x = 6,682.33/67.11
  6. Step 6: Final answer
    x = 99.57

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.