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Finding the Fourth Proportional to 50.71, 69.98 and 28.87

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Solution

The fourth proportional to 50.71, 69.98 and 28.87 is: 39.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    50.71 : 69.98 = 28.87 : x
  2. Step 2: Convert to fraction form
    50.71/69.98 = 28.87/x
  3. Step 3: Cross multiply
    50.71x = 69.98 × 28.87
  4. Step 4: Simplify right side
    50.71x = 2,019.97
  5. Step 5: Solve for x
    x = 2,019.97/50.71
  6. Step 6: Final answer
    x = 39.84

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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.