Home / 20,920-31,392.96-12,159.04

Finding the Fourth Proportional to 20,920, 31,392.96 and 12,159.04

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Solution

The fourth proportional to 20,920, 31,392.96 and 12,159.04 is: 18,246.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,920 : 31,392.96 = 12,159.04 : x
  2. Step 2: Convert to fraction form
    20,920/31,392.96 = 12,159.04/x
  3. Step 3: Cross multiply
    20,920x = 31,392.96 × 12,159.04
  4. Step 4: Simplify right side
    20,920x = 381,708,256.36
  5. Step 5: Solve for x
    x = 381,708,256.36/20,920
  6. Step 6: Final answer
    x = 18,246.09

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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.