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Finding the Fourth Proportional to 84.80, 116.97 and 57.12

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Solution

The fourth proportional to 84.80, 116.97 and 57.12 is: 78.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.80 : 116.97 = 57.12 : x
  2. Step 2: Convert to fraction form
    84.80/116.97 = 57.12/x
  3. Step 3: Cross multiply
    84.80x = 116.97 × 57.12
  4. Step 4: Simplify right side
    84.80x = 6,681.33
  5. Step 5: Solve for x
    x = 6,681.33/84.80
  6. Step 6: Final answer
    x = 78.79

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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.