Home / 20,849.72-31,243.20-12,520.64

Finding the Fourth Proportional to 20,849.72, 31,243.20 and 12,520.64

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Solution

The fourth proportional to 20,849.72, 31,243.20 and 12,520.64 is: 18,762.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,849.72 : 31,243.20 = 12,520.64 : x
  2. Step 2: Convert to fraction form
    20,849.72/31,243.20 = 12,520.64/x
  3. Step 3: Cross multiply
    20,849.72x = 31,243.20 × 12,520.64
  4. Step 4: Simplify right side
    20,849.72x = 391,184,859.65
  5. Step 5: Solve for x
    x = 391,184,859.65/20,849.72
  6. Step 6: Final answer
    x = 18,762.12

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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.