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Finding the Fourth Proportional to 57.31, 85.94 and 28.40

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Solution

The fourth proportional to 57.31, 85.94 and 28.40 is: 42.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.31 : 85.94 = 28.40 : x
  2. Step 2: Convert to fraction form
    57.31/85.94 = 28.40/x
  3. Step 3: Cross multiply
    57.31x = 85.94 × 28.40
  4. Step 4: Simplify right side
    57.31x = 2,440.87
  5. Step 5: Solve for x
    x = 2,440.87/57.31
  6. Step 6: Final answer
    x = 42.59

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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.