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Finding the Fourth Proportional to 51.89, 71.57 and 38.75

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Solution

The fourth proportional to 51.89, 71.57 and 38.75 is: 53.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    51.89 : 71.57 = 38.75 : x
  2. Step 2: Convert to fraction form
    51.89/71.57 = 38.75/x
  3. Step 3: Cross multiply
    51.89x = 71.57 × 38.75
  4. Step 4: Simplify right side
    51.89x = 2,772.79
  5. Step 5: Solve for x
    x = 2,772.79/51.89
  6. Step 6: Final answer
    x = 53.44

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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.