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Finding the Fourth Proportional to 68.21, 101.51 and 66.39

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Solution

The fourth proportional to 68.21, 101.51 and 66.39 is: 98.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    68.21 : 101.51 = 66.39 : x
  2. Step 2: Convert to fraction form
    68.21/101.51 = 66.39/x
  3. Step 3: Cross multiply
    68.21x = 101.51 × 66.39
  4. Step 4: Simplify right side
    68.21x = 6,738.92
  5. Step 5: Solve for x
    x = 6,738.92/68.21
  6. Step 6: Final answer
    x = 98.80

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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.