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Finding the Fourth Proportional to 50.43, 69.55 and 31

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Solution

The fourth proportional to 50.43, 69.55 and 31 is: 42.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    50.43 : 69.55 = 31 : x
  2. Step 2: Convert to fraction form
    50.43/69.55 = 31/x
  3. Step 3: Cross multiply
    50.43x = 69.55 × 31
  4. Step 4: Simplify right side
    50.43x = 2,156.05
  5. Step 5: Solve for x
    x = 2,156.05/50.43
  6. Step 6: Final answer
    x = 42.75

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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.