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Finding the Fourth Proportional to 2,861.90, 3,947.60 and 1,854.92

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Solution

The fourth proportional to 2,861.90, 3,947.60 and 1,854.92 is: 2,558.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,861.90 : 3,947.60 = 1,854.92 : x
  2. Step 2: Convert to fraction form
    2,861.90/3,947.60 = 1,854.92/x
  3. Step 3: Cross multiply
    2,861.90x = 3,947.60 × 1,854.92
  4. Step 4: Simplify right side
    2,861.90x = 7,322,482.19
  5. Step 5: Solve for x
    x = 7,322,482.19/2,861.90
  6. Step 6: Final answer
    x = 2,558.61

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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.