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Finding the Fourth Proportional to 50.85, 76.18 and 42.70

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Solution

The fourth proportional to 50.85, 76.18 and 42.70 is: 63.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    50.85 : 76.18 = 42.70 : x
  2. Step 2: Convert to fraction form
    50.85/76.18 = 42.70/x
  3. Step 3: Cross multiply
    50.85x = 76.18 × 42.70
  4. Step 4: Simplify right side
    50.85x = 3,252.89
  5. Step 5: Solve for x
    x = 3,252.89/50.85
  6. Step 6: Final answer
    x = 63.97

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.