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Finding the Fourth Proportional to 51.86, 77.76 and 31.55

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Solution

The fourth proportional to 51.86, 77.76 and 31.55 is: 47.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    51.86 : 77.76 = 31.55 : x
  2. Step 2: Convert to fraction form
    51.86/77.76 = 31.55/x
  3. Step 3: Cross multiply
    51.86x = 77.76 × 31.55
  4. Step 4: Simplify right side
    51.86x = 2,452.94
  5. Step 5: Solve for x
    x = 2,452.94/51.86
  6. Step 6: Final answer
    x = 47.30

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.