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Finding the Fourth Proportional to 68.22, 101.79 and 66.15

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Solution

The fourth proportional to 68.22, 101.79 and 66.15 is: 98.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    68.22 : 101.79 = 66.15 : x
  2. Step 2: Convert to fraction form
    68.22/101.79 = 66.15/x
  3. Step 3: Cross multiply
    68.22x = 101.79 × 66.15
  4. Step 4: Simplify right side
    68.22x = 6,733.41
  5. Step 5: Solve for x
    x = 6,733.41/68.22
  6. Step 6: Final answer
    x = 98.70

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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.