Home / 20,446.32-28,220.76-12,990

Finding the Fourth Proportional to 20,446.32, 28,220.76 and 12,990

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Solution

The fourth proportional to 20,446.32, 28,220.76 and 12,990 is: 17,929.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,446.32 : 28,220.76 = 12,990 : x
  2. Step 2: Convert to fraction form
    20,446.32/28,220.76 = 12,990/x
  3. Step 3: Cross multiply
    20,446.32x = 28,220.76 × 12,990
  4. Step 4: Simplify right side
    20,446.32x = 366,587,672.40
  5. Step 5: Solve for x
    x = 366,587,672.40/20,446.32
  6. Step 6: Final answer
    x = 17,929.27

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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.