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Finding the Fourth Proportional to 51.50, 77.18 and 31.20

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Solution

The fourth proportional to 51.50, 77.18 and 31.20 is: 46.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    51.50 : 77.18 = 31.20 : x
  2. Step 2: Convert to fraction form
    51.50/77.18 = 31.20/x
  3. Step 3: Cross multiply
    51.50x = 77.18 × 31.20
  4. Step 4: Simplify right side
    51.50x = 2,407.86
  5. Step 5: Solve for x
    x = 2,407.86/51.50
  6. Step 6: Final answer
    x = 46.76

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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.