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Finding the Fourth Proportional to 12,863.78, 19,300.80 and 6,288.20

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Solution

The fourth proportional to 12,863.78, 19,300.80 and 6,288.20 is: 9,434.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,863.78 : 19,300.80 = 6,288.20 : x
  2. Step 2: Convert to fraction form
    12,863.78/19,300.80 = 6,288.20/x
  3. Step 3: Cross multiply
    12,863.78x = 19,300.80 × 6,288.20
  4. Step 4: Simplify right side
    12,863.78x = 121,367,290.56
  5. Step 5: Solve for x
    x = 121,367,290.56/12,863.78
  6. Step 6: Final answer
    x = 9,434.81

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.