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Finding the Fourth Proportional to 68.18, 101.72 and 67.57

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Solution

The fourth proportional to 68.18, 101.72 and 67.57 is: 100.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    68.18 : 101.72 = 67.57 : x
  2. Step 2: Convert to fraction form
    68.18/101.72 = 67.57/x
  3. Step 3: Cross multiply
    68.18x = 101.72 × 67.57
  4. Step 4: Simplify right side
    68.18x = 6,873.14
  5. Step 5: Solve for x
    x = 6,873.14/68.18
  6. Step 6: Final answer
    x = 100.82

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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.