Home / 20,401.56-28,155.56-11,905.72

Finding the Fourth Proportional to 20,401.56, 28,155.56 and 11,905.72

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Solution

The fourth proportional to 20,401.56, 28,155.56 and 11,905.72 is: 16,430.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,401.56 : 28,155.56 = 11,905.72 : x
  2. Step 2: Convert to fraction form
    20,401.56/28,155.56 = 11,905.72/x
  3. Step 3: Cross multiply
    20,401.56x = 28,155.56 × 11,905.72
  4. Step 4: Simplify right side
    20,401.56x = 335,212,213.80
  5. Step 5: Solve for x
    x = 335,212,213.80/20,401.56
  6. Step 6: Final answer
    x = 16,430.71

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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.