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Finding the Fourth Proportional to 51.54, 71.02 and 39.82

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Solution

The fourth proportional to 51.54, 71.02 and 39.82 is: 54.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    51.54 : 71.02 = 39.82 : x
  2. Step 2: Convert to fraction form
    51.54/71.02 = 39.82/x
  3. Step 3: Cross multiply
    51.54x = 71.02 × 39.82
  4. Step 4: Simplify right side
    51.54x = 2,828.02
  5. Step 5: Solve for x
    x = 2,828.02/51.54
  6. Step 6: Final answer
    x = 54.87

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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.