Home / 20,191.87-30,256.31-12,780.67

Finding the Fourth Proportional to 20,191.87, 30,256.31 and 12,780.67

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Solution

The fourth proportional to 20,191.87, 30,256.31 and 12,780.67 is: 19,151.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,191.87 : 30,256.31 = 12,780.67 : x
  2. Step 2: Convert to fraction form
    20,191.87/30,256.31 = 12,780.67/x
  3. Step 3: Cross multiply
    20,191.87x = 30,256.31 × 12,780.67
  4. Step 4: Simplify right side
    20,191.87x = 386,695,913.53
  5. Step 5: Solve for x
    x = 386,695,913.53/20,191.87
  6. Step 6: Final answer
    x = 19,151.07

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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.