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Finding the Fourth Proportional to 68.76, 103.61 and 66.02

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Solution

The fourth proportional to 68.76, 103.61 and 66.02 is: 99.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    68.76 : 103.61 = 66.02 : x
  2. Step 2: Convert to fraction form
    68.76/103.61 = 66.02/x
  3. Step 3: Cross multiply
    68.76x = 103.61 × 66.02
  4. Step 4: Simplify right side
    68.76x = 6,839.98
  5. Step 5: Solve for x
    x = 6,839.98/68.76
  6. Step 6: Final answer
    x = 99.48

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.