Home / 20,620.50-28,456.16-11,189.07

Finding the Fourth Proportional to 20,620.50, 28,456.16 and 11,189.07

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Solution

The fourth proportional to 20,620.50, 28,456.16 and 11,189.07 is: 15,440.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,620.50 : 28,456.16 = 11,189.07 : x
  2. Step 2: Convert to fraction form
    20,620.50/28,456.16 = 11,189.07/x
  3. Step 3: Cross multiply
    20,620.50x = 28,456.16 × 11,189.07
  4. Step 4: Simplify right side
    20,620.50x = 318,397,910.23
  5. Step 5: Solve for x
    x = 318,397,910.23/20,620.50
  6. Step 6: Final answer
    x = 15,440.84

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1.5x scale

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.