Home / 13,886.20-20,831.10-6,869.80

Finding the Fourth Proportional to 13,886.20, 20,831.10 and 6,869.80

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Solution

The fourth proportional to 13,886.20, 20,831.10 and 6,869.80 is: 10,305.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,886.20 : 20,831.10 = 6,869.80 : x
  2. Step 2: Convert to fraction form
    13,886.20/20,831.10 = 6,869.80/x
  3. Step 3: Cross multiply
    13,886.20x = 20,831.10 × 6,869.80
  4. Step 4: Simplify right side
    13,886.20x = 143,105,490.78
  5. Step 5: Solve for x
    x = 143,105,490.78/13,886.20
  6. Step 6: Final answer
    x = 10,305.59

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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.