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Finding the Fourth Proportional to 57.43, 85.57 and 51.28

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Solution

The fourth proportional to 57.43, 85.57 and 51.28 is: 76.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.43 : 85.57 = 51.28 : x
  2. Step 2: Convert to fraction form
    57.43/85.57 = 51.28/x
  3. Step 3: Cross multiply
    57.43x = 85.57 × 51.28
  4. Step 4: Simplify right side
    57.43x = 4,388.03
  5. Step 5: Solve for x
    x = 4,388.03/57.43
  6. Step 6: Final answer
    x = 76.41

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.