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Finding the Fourth Proportional to 51.74, 71.34 and 38.78

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Solution

The fourth proportional to 51.74, 71.34 and 38.78 is: 53.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    51.74 : 71.34 = 38.78 : x
  2. Step 2: Convert to fraction form
    51.74/71.34 = 38.78/x
  3. Step 3: Cross multiply
    51.74x = 71.34 × 38.78
  4. Step 4: Simplify right side
    51.74x = 2,766.57
  5. Step 5: Solve for x
    x = 2,766.57/51.74
  6. Step 6: Final answer
    x = 53.47

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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.