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Finding the Fourth Proportional to 50.80, 70.05 and 31.39

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Solution

The fourth proportional to 50.80, 70.05 and 31.39 is: 43.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    50.80 : 70.05 = 31.39 : x
  2. Step 2: Convert to fraction form
    50.80/70.05 = 31.39/x
  3. Step 3: Cross multiply
    50.80x = 70.05 × 31.39
  4. Step 4: Simplify right side
    50.80x = 2,198.87
  5. Step 5: Solve for x
    x = 2,198.87/50.80
  6. Step 6: Final answer
    x = 43.28

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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.