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Finding the Fourth Proportional to 84.62, 116.82 and 57.00

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Solution

The fourth proportional to 84.62, 116.82 and 57.00 is: 78.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.62 : 116.82 = 57.00 : x
  2. Step 2: Convert to fraction form
    84.62/116.82 = 57.00/x
  3. Step 3: Cross multiply
    84.62x = 116.82 × 57.00
  4. Step 4: Simplify right side
    84.62x = 6,659.02
  5. Step 5: Solve for x
    x = 6,659.02/84.62
  6. Step 6: Final answer
    x = 78.69

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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.