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Finding the Fourth Proportional to 70.74, 97.68 and 67.32

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Solution

The fourth proportional to 70.74, 97.68 and 67.32 is: 92.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.74 : 97.68 = 67.32 : x
  2. Step 2: Convert to fraction form
    70.74/97.68 = 67.32/x
  3. Step 3: Cross multiply
    70.74x = 97.68 × 67.32
  4. Step 4: Simplify right side
    70.74x = 6,575.82
  5. Step 5: Solve for x
    x = 6,575.82/70.74
  6. Step 6: Final answer
    x = 92.96

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.