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Finding the Fourth Proportional to 6,489.87, 8,956.35 and 3,971.19

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Solution

The fourth proportional to 6,489.87, 8,956.35 and 3,971.19 is: 5,480.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,489.87 : 8,956.35 = 3,971.19 : x
  2. Step 2: Convert to fraction form
    6,489.87/8,956.35 = 3,971.19/x
  3. Step 3: Cross multiply
    6,489.87x = 8,956.35 × 3,971.19
  4. Step 4: Simplify right side
    6,489.87x = 35,567,302.92
  5. Step 5: Solve for x
    x = 35,567,302.92/6,489.87
  6. Step 6: Final answer
    x = 5,480.44

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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.