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Finding the Fourth Proportional to 84.12, 116.06 and 67.74

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Solution

The fourth proportional to 84.12, 116.06 and 67.74 is: 93.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.12 : 116.06 = 67.74 : x
  2. Step 2: Convert to fraction form
    84.12/116.06 = 67.74/x
  3. Step 3: Cross multiply
    84.12x = 116.06 × 67.74
  4. Step 4: Simplify right side
    84.12x = 7,861.57
  5. Step 5: Solve for x
    x = 7,861.57/84.12
  6. Step 6: Final answer
    x = 93.46

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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.