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Finding the Fourth Proportional to 67.11, 99.86 and 66.07

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Solution

The fourth proportional to 67.11, 99.86 and 66.07 is: 98.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    67.11 : 99.86 = 66.07 : x
  2. Step 2: Convert to fraction form
    67.11/99.86 = 66.07/x
  3. Step 3: Cross multiply
    67.11x = 99.86 × 66.07
  4. Step 4: Simplify right side
    67.11x = 6,597.75
  5. Step 5: Solve for x
    x = 6,597.75/67.11
  6. Step 6: Final answer
    x = 98.32

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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.