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Finding the Fourth Proportional to 6,388.11, 8,813.52 and 3,869.40

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Solution

The fourth proportional to 6,388.11, 8,813.52 and 3,869.40 is: 5,338.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,388.11 : 8,813.52 = 3,869.40 : x
  2. Step 2: Convert to fraction form
    6,388.11/8,813.52 = 3,869.40/x
  3. Step 3: Cross multiply
    6,388.11x = 8,813.52 × 3,869.40
  4. Step 4: Simplify right side
    6,388.11x = 34,103,034.29
  5. Step 5: Solve for x
    x = 34,103,034.29/6,388.11
  6. Step 6: Final answer
    x = 5,338.52

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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.