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Finding the Fourth Proportional to 50.15, 69.18 and 31.72

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Solution

The fourth proportional to 50.15, 69.18 and 31.72 is: 43.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    50.15 : 69.18 = 31.72 : x
  2. Step 2: Convert to fraction form
    50.15/69.18 = 31.72/x
  3. Step 3: Cross multiply
    50.15x = 69.18 × 31.72
  4. Step 4: Simplify right side
    50.15x = 2,194.39
  5. Step 5: Solve for x
    x = 2,194.39/50.15
  6. Step 6: Final answer
    x = 43.76

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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.