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Finding the Fourth Proportional to 12,869.08, 17,767.34 and 9,879.20

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Solution

The fourth proportional to 12,869.08, 17,767.34 and 9,879.20 is: 13,639.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,869.08 : 17,767.34 = 9,879.20 : x
  2. Step 2: Convert to fraction form
    12,869.08/17,767.34 = 9,879.20/x
  3. Step 3: Cross multiply
    12,869.08x = 17,767.34 × 9,879.20
  4. Step 4: Simplify right side
    12,869.08x = 175,527,105.33
  5. Step 5: Solve for x
    x = 175,527,105.33/12,869.08
  6. Step 6: Final answer
    x = 13,639.44

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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.