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Finding the Fourth Proportional to 6,439.60, 8,888.76 and 3,786.88

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Solution

The fourth proportional to 6,439.60, 8,888.76 and 3,786.88 is: 5,227.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,439.60 : 8,888.76 = 3,786.88 : x
  2. Step 2: Convert to fraction form
    6,439.60/8,888.76 = 3,786.88/x
  3. Step 3: Cross multiply
    6,439.60x = 8,888.76 × 3,786.88
  4. Step 4: Simplify right side
    6,439.60x = 33,660,667.47
  5. Step 5: Solve for x
    x = 33,660,667.47/6,439.60
  6. Step 6: Final answer
    x = 5,227.14

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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.