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Finding the Fourth Proportional to 51.91, 71.59 and 39.61

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Solution

The fourth proportional to 51.91, 71.59 and 39.61 is: 54.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    51.91 : 71.59 = 39.61 : x
  2. Step 2: Convert to fraction form
    51.91/71.59 = 39.61/x
  3. Step 3: Cross multiply
    51.91x = 71.59 × 39.61
  4. Step 4: Simplify right side
    51.91x = 2,835.68
  5. Step 5: Solve for x
    x = 2,835.68/51.91
  6. Step 6: Final answer
    x = 54.63

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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.