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Finding the Fourth Proportional to 57.14, 78.84 and 42.96

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Solution

The fourth proportional to 57.14, 78.84 and 42.96 is: 59.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.14 : 78.84 = 42.96 : x
  2. Step 2: Convert to fraction form
    57.14/78.84 = 42.96/x
  3. Step 3: Cross multiply
    57.14x = 78.84 × 42.96
  4. Step 4: Simplify right side
    57.14x = 3,386.97
  5. Step 5: Solve for x
    x = 3,386.97/57.14
  6. Step 6: Final answer
    x = 59.27

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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.