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Finding the Fourth Proportional to 57.40, 85.95 and 42.28

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Solution

The fourth proportional to 57.40, 85.95 and 42.28 is: 63.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.40 : 85.95 = 42.28 : x
  2. Step 2: Convert to fraction form
    57.40/85.95 = 42.28/x
  3. Step 3: Cross multiply
    57.40x = 85.95 × 42.28
  4. Step 4: Simplify right side
    57.40x = 3,633.97
  5. Step 5: Solve for x
    x = 3,633.97/57.40
  6. Step 6: Final answer
    x = 63.31

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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.