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Finding the Fourth Proportional to 57.76, 80.16 and 56.48

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Solution

The fourth proportional to 57.76, 80.16 and 56.48 is: 78.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.76 : 80.16 = 56.48 : x
  2. Step 2: Convert to fraction form
    57.76/80.16 = 56.48/x
  3. Step 3: Cross multiply
    57.76x = 80.16 × 56.48
  4. Step 4: Simplify right side
    57.76x = 4,527.44
  5. Step 5: Solve for x
    x = 4,527.44/57.76
  6. Step 6: Final answer
    x = 78.38

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.