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Finding the Fourth Proportional to 3,900.48, 5,382.48 and 2,131.74

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Solution

The fourth proportional to 3,900.48, 5,382.48 and 2,131.74 is: 2,941.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,900.48 : 5,382.48 = 2,131.74 : x
  2. Step 2: Convert to fraction form
    3,900.48/5,382.48 = 2,131.74/x
  3. Step 3: Cross multiply
    3,900.48x = 5,382.48 × 2,131.74
  4. Step 4: Simplify right side
    3,900.48x = 11,474,047.92
  5. Step 5: Solve for x
    x = 11,474,047.92/3,900.48
  6. Step 6: Final answer
    x = 2,941.70

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.