Home / 20,490.72-30,721.50-12,150.96

Finding the Fourth Proportional to 20,490.72, 30,721.50 and 12,150.96

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Solution

The fourth proportional to 20,490.72, 30,721.50 and 12,150.96 is: 18,217.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,490.72 : 30,721.50 = 12,150.96 : x
  2. Step 2: Convert to fraction form
    20,490.72/30,721.50 = 12,150.96/x
  3. Step 3: Cross multiply
    20,490.72x = 30,721.50 × 12,150.96
  4. Step 4: Simplify right side
    20,490.72x = 373,295,717.64
  5. Step 5: Solve for x
    x = 373,295,717.64/20,490.72
  6. Step 6: Final answer
    x = 18,217.79

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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.