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Finding the Fourth Proportional to 67.14, 99.90 and 66.90

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Solution

The fourth proportional to 67.14, 99.90 and 66.90 is: 99.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    67.14 : 99.90 = 66.90 : x
  2. Step 2: Convert to fraction form
    67.14/99.90 = 66.90/x
  3. Step 3: Cross multiply
    67.14x = 99.90 × 66.90
  4. Step 4: Simplify right side
    67.14x = 6,683.31
  5. Step 5: Solve for x
    x = 6,683.31/67.14
  6. Step 6: Final answer
    x = 99.54

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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.