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Finding the Fourth Proportional to 51.42, 76.78 and 49.54

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Solution

The fourth proportional to 51.42, 76.78 and 49.54 is: 73.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    51.42 : 76.78 = 49.54 : x
  2. Step 2: Convert to fraction form
    51.42/76.78 = 49.54/x
  3. Step 3: Cross multiply
    51.42x = 76.78 × 49.54
  4. Step 4: Simplify right side
    51.42x = 3,803.30
  5. Step 5: Solve for x
    x = 3,803.30/51.42
  6. Step 6: Final answer
    x = 73.97

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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.