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Finding the Fourth Proportional to 3,861.75, 5,331.51 and 2,928.63

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Solution

The fourth proportional to 3,861.75, 5,331.51 and 2,928.63 is: 4,043.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,861.75 : 5,331.51 = 2,928.63 : x
  2. Step 2: Convert to fraction form
    3,861.75/5,331.51 = 2,928.63/x
  3. Step 3: Cross multiply
    3,861.75x = 5,331.51 × 2,928.63
  4. Step 4: Simplify right side
    3,861.75x = 15,614,020.13
  5. Step 5: Solve for x
    x = 15,614,020.13/3,861.75
  6. Step 6: Final answer
    x = 4,043.25

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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.