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Finding the Fourth Proportional to 50.52, 69.70 and 39

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Solution

The fourth proportional to 50.52, 69.70 and 39 is: 53.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    50.52 : 69.70 = 39 : x
  2. Step 2: Convert to fraction form
    50.52/69.70 = 39/x
  3. Step 3: Cross multiply
    50.52x = 69.70 × 39
  4. Step 4: Simplify right side
    50.52x = 2,718.30
  5. Step 5: Solve for x
    x = 2,718.30/50.52
  6. Step 6: Final answer
    x = 53.81

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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.