Home / 13,831.20-20,821.56-12,606.48

Finding the Fourth Proportional to 13,831.20, 20,821.56 and 12,606.48

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Solution

The fourth proportional to 13,831.20, 20,821.56 and 12,606.48 is: 18,977.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,831.20 : 20,821.56 = 12,606.48 : x
  2. Step 2: Convert to fraction form
    13,831.20/20,821.56 = 12,606.48/x
  3. Step 3: Cross multiply
    13,831.20x = 20,821.56 × 12,606.48
  4. Step 4: Simplify right side
    13,831.20x = 262,486,579.71
  5. Step 5: Solve for x
    x = 262,486,579.71/13,831.20
  6. Step 6: Final answer
    x = 18,977.86

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.