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Finding the Fourth Proportional to 84.65, 116.78 and 68.18

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Solution

The fourth proportional to 84.65, 116.78 and 68.18 is: 94.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.65 : 116.78 = 68.18 : x
  2. Step 2: Convert to fraction form
    84.65/116.78 = 68.18/x
  3. Step 3: Cross multiply
    84.65x = 116.78 × 68.18
  4. Step 4: Simplify right side
    84.65x = 7,961.14
  5. Step 5: Solve for x
    x = 7,961.14/84.65
  6. Step 6: Final answer
    x = 94.05

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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.