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Finding the Fourth Proportional to 5,105.80, 7,658.70 and 2,639.80

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Solution

The fourth proportional to 5,105.80, 7,658.70 and 2,639.80 is: 3,959.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,105.80 : 7,658.70 = 2,639.80 : x
  2. Step 2: Convert to fraction form
    5,105.80/7,658.70 = 2,639.80/x
  3. Step 3: Cross multiply
    5,105.80x = 7,658.70 × 2,639.80
  4. Step 4: Simplify right side
    5,105.80x = 20,217,436.26
  5. Step 5: Solve for x
    x = 20,217,436.26/5,105.80
  6. Step 6: Final answer
    x = 3,959.70

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1.5x scale

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.