Home / 20,669.60-31,004.40-12,375.20

Finding the Fourth Proportional to 20,669.60, 31,004.40 and 12,375.20

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Solution

The fourth proportional to 20,669.60, 31,004.40 and 12,375.20 is: 18,562.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,669.60 : 31,004.40 = 12,375.20 : x
  2. Step 2: Convert to fraction form
    20,669.60/31,004.40 = 12,375.20/x
  3. Step 3: Cross multiply
    20,669.60x = 31,004.40 × 12,375.20
  4. Step 4: Simplify right side
    20,669.60x = 383,685,650.88
  5. Step 5: Solve for x
    x = 383,685,650.88/20,669.60
  6. Step 6: Final answer
    x = 18,562.80

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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.