Home / 20,820.39-28,732.55-11,389.56

Finding the Fourth Proportional to 20,820.39, 28,732.55 and 11,389.56

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Solution

The fourth proportional to 20,820.39, 28,732.55 and 11,389.56 is: 15,717.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,820.39 : 28,732.55 = 11,389.56 : x
  2. Step 2: Convert to fraction form
    20,820.39/28,732.55 = 11,389.56/x
  3. Step 3: Cross multiply
    20,820.39x = 28,732.55 × 11,389.56
  4. Step 4: Simplify right side
    20,820.39x = 327,251,102.18
  5. Step 5: Solve for x
    x = 327,251,102.18/20,820.39
  6. Step 6: Final answer
    x = 15,717.82

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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.