Home / 20,929.28-31,399.38-12,155.76

Finding the Fourth Proportional to 20,929.28, 31,399.38 and 12,155.76

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Solution

The fourth proportional to 20,929.28, 31,399.38 and 12,155.76 is: 18,236.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,929.28 : 31,399.38 = 12,155.76 : x
  2. Step 2: Convert to fraction form
    20,929.28/31,399.38 = 12,155.76/x
  3. Step 3: Cross multiply
    20,929.28x = 31,399.38 × 12,155.76
  4. Step 4: Simplify right side
    20,929.28x = 381,683,327.43
  5. Step 5: Solve for x
    x = 381,683,327.43/20,929.28
  6. Step 6: Final answer
    x = 18,236.81

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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.