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Finding the Fourth Proportional to 51.20, 76.68 and 39.08

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Solution

The fourth proportional to 51.20, 76.68 and 39.08 is: 58.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    51.20 : 76.68 = 39.08 : x
  2. Step 2: Convert to fraction form
    51.20/76.68 = 39.08/x
  3. Step 3: Cross multiply
    51.20x = 76.68 × 39.08
  4. Step 4: Simplify right side
    51.20x = 2,996.65
  5. Step 5: Solve for x
    x = 2,996.65/51.20
  6. Step 6: Final answer
    x = 58.53

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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.