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Finding the Fourth Proportional to 57.82, 87.19 and 56.74

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Solution

The fourth proportional to 57.82, 87.19 and 56.74 is: 85.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.82 : 87.19 = 56.74 : x
  2. Step 2: Convert to fraction form
    57.82/87.19 = 56.74/x
  3. Step 3: Cross multiply
    57.82x = 87.19 × 56.74
  4. Step 4: Simplify right side
    57.82x = 4,947.16
  5. Step 5: Solve for x
    x = 4,947.16/57.82
  6. Step 6: Final answer
    x = 85.56

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.