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Finding the Fourth Proportional to 50.09, 69.15 and 30.71

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Solution

The fourth proportional to 50.09, 69.15 and 30.71 is: 42.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    50.09 : 69.15 = 30.71 : x
  2. Step 2: Convert to fraction form
    50.09/69.15 = 30.71/x
  3. Step 3: Cross multiply
    50.09x = 69.15 × 30.71
  4. Step 4: Simplify right side
    50.09x = 2,123.60
  5. Step 5: Solve for x
    x = 2,123.60/50.09
  6. Step 6: Final answer
    x = 42.40

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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.