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Finding the Fourth Proportional to 68.08, 101.36 and 67.72

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Solution

The fourth proportional to 68.08, 101.36 and 67.72 is: 100.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    68.08 : 101.36 = 67.72 : x
  2. Step 2: Convert to fraction form
    68.08/101.36 = 67.72/x
  3. Step 3: Cross multiply
    68.08x = 101.36 × 67.72
  4. Step 4: Simplify right side
    68.08x = 6,864.10
  5. Step 5: Solve for x
    x = 6,864.10/68.08
  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.