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Finding the Fourth Proportional to 50.79, 76.49 and 42.75

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Solution

The fourth proportional to 50.79, 76.49 and 42.75 is: 64.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    50.79 : 76.49 = 42.75 : x
  2. Step 2: Convert to fraction form
    50.79/76.49 = 42.75/x
  3. Step 3: Cross multiply
    50.79x = 76.49 × 42.75
  4. Step 4: Simplify right side
    50.79x = 3,269.73
  5. Step 5: Solve for x
    x = 3,269.73/50.79
  6. Step 6: Final answer
    x = 64.38

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.