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Finding the Fourth Proportional to 51.26, 76.90 and 39.30

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Solution

The fourth proportional to 51.26, 76.90 and 39.30 is: 58.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    51.26 : 76.90 = 39.30 : x
  2. Step 2: Convert to fraction form
    51.26/76.90 = 39.30/x
  3. Step 3: Cross multiply
    51.26x = 76.90 × 39.30
  4. Step 4: Simplify right side
    51.26x = 3,022.17
  5. Step 5: Solve for x
    x = 3,022.17/51.26
  6. Step 6: Final answer
    x = 58.96

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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.