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Finding the Fourth Proportional to 57.28, 78.90 and 49.96

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Solution

The fourth proportional to 57.28, 78.90 and 49.96 is: 68.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.28 : 78.90 = 49.96 : x
  2. Step 2: Convert to fraction form
    57.28/78.90 = 49.96/x
  3. Step 3: Cross multiply
    57.28x = 78.90 × 49.96
  4. Step 4: Simplify right side
    57.28x = 3,941.84
  5. Step 5: Solve for x
    x = 3,941.84/57.28
  6. Step 6: Final answer
    x = 68.82

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.