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Finding the Fourth Proportional to 70.84, 97.67 and 61.49

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Solution

The fourth proportional to 70.84, 97.67 and 61.49 is: 84.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.84 : 97.67 = 61.49 : x
  2. Step 2: Convert to fraction form
    70.84/97.67 = 61.49/x
  3. Step 3: Cross multiply
    70.84x = 97.67 × 61.49
  4. Step 4: Simplify right side
    70.84x = 6,005.58
  5. Step 5: Solve for x
    x = 6,005.58/70.84
  6. Step 6: Final answer
    x = 84.78

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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.