Home / 21,003.80-31,440.90-12,212.60

Finding the Fourth Proportional to 21,003.80, 31,440.90 and 12,212.60

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Solution

The fourth proportional to 21,003.80, 31,440.90 and 12,212.60 is: 18,281.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,003.80 : 31,440.90 = 12,212.60 : x
  2. Step 2: Convert to fraction form
    21,003.80/31,440.90 = 12,212.60/x
  3. Step 3: Cross multiply
    21,003.80x = 31,440.90 × 12,212.60
  4. Step 4: Simplify right side
    21,003.80x = 383,975,135.34
  5. Step 5: Solve for x
    x = 383,975,135.34/21,003.80
  6. Step 6: Final answer
    x = 18,281.22

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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.