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Finding the Fourth Proportional to 3,934.80, 5,903.28 and 3,115.80

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Solution

The fourth proportional to 3,934.80, 5,903.28 and 3,115.80 is: 4,674.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,934.80 : 5,903.28 = 3,115.80 : x
  2. Step 2: Convert to fraction form
    3,934.80/5,903.28 = 3,115.80/x
  3. Step 3: Cross multiply
    3,934.80x = 5,903.28 × 3,115.80
  4. Step 4: Simplify right side
    3,934.80x = 18,393,439.82
  5. Step 5: Solve for x
    x = 18,393,439.82/3,934.80
  6. Step 6: Final answer
    x = 4,674.56

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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.