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Finding the Fourth Proportional to 69.42, 103.30 and 66.18

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Solution

The fourth proportional to 69.42, 103.30 and 66.18 is: 98.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.42 : 103.30 = 66.18 : x
  2. Step 2: Convert to fraction form
    69.42/103.30 = 66.18/x
  3. Step 3: Cross multiply
    69.42x = 103.30 × 66.18
  4. Step 4: Simplify right side
    69.42x = 6,836.39
  5. Step 5: Solve for x
    x = 6,836.39/69.42
  6. Step 6: Final answer
    x = 98.48

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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.