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Finding the Fourth Proportional to 84.38, 116.51 and 51.65

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Solution

The fourth proportional to 84.38, 116.51 and 51.65 is: 71.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.38 : 116.51 = 51.65 : x
  2. Step 2: Convert to fraction form
    84.38/116.51 = 51.65/x
  3. Step 3: Cross multiply
    84.38x = 116.51 × 51.65
  4. Step 4: Simplify right side
    84.38x = 6,016.90
  5. Step 5: Solve for x
    x = 6,016.90/84.38
  6. Step 6: Final answer
    x = 71.31

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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.