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Finding the Fourth Proportional to 84.79, 126.96 and 57.35

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Solution

The fourth proportional to 84.79, 126.96 and 57.35 is: 85.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.79 : 126.96 = 57.35 : x
  2. Step 2: Convert to fraction form
    84.79/126.96 = 57.35/x
  3. Step 3: Cross multiply
    84.79x = 126.96 × 57.35
  4. Step 4: Simplify right side
    84.79x = 7,280.87
  5. Step 5: Solve for x
    x = 7,280.87/84.79
  6. Step 6: Final answer
    x = 85.87

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.