Home / 20,820.30-28,729.33-12,757.56

Finding the Fourth Proportional to 20,820.30, 28,729.33 and 12,757.56

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Solution

The fourth proportional to 20,820.30, 28,729.33 and 12,757.56 is: 17,603.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,820.30 : 28,729.33 = 12,757.56 : x
  2. Step 2: Convert to fraction form
    20,820.30/28,729.33 = 12,757.56/x
  3. Step 3: Cross multiply
    20,820.30x = 28,729.33 × 12,757.56
  4. Step 4: Simplify right side
    20,820.30x = 366,516,151.23
  5. Step 5: Solve for x
    x = 366,516,151.23/20,820.30
  6. Step 6: Final answer
    x = 17,603.79

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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.