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Finding the Fourth Proportional to 70.81, 98.17 and 67.15

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Solution

The fourth proportional to 70.81, 98.17 and 67.15 is: 93.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.81 : 98.17 = 67.15 : x
  2. Step 2: Convert to fraction form
    70.81/98.17 = 67.15/x
  3. Step 3: Cross multiply
    70.81x = 98.17 × 67.15
  4. Step 4: Simplify right side
    70.81x = 6,592.12
  5. Step 5: Solve for x
    x = 6,592.12/70.81
  6. Step 6: Final answer
    x = 93.10

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.