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Finding the Fourth Proportional to 50.61, 69.78 and 38.91

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Solution

The fourth proportional to 50.61, 69.78 and 38.91 is: 53.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    50.61 : 69.78 = 38.91 : x
  2. Step 2: Convert to fraction form
    50.61/69.78 = 38.91/x
  3. Step 3: Cross multiply
    50.61x = 69.78 × 38.91
  4. Step 4: Simplify right side
    50.61x = 2,715.14
  5. Step 5: Solve for x
    x = 2,715.14/50.61
  6. Step 6: Final answer
    x = 53.65

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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.