Home / 20,815.99-31,234.24-9,721.07

Finding the Fourth Proportional to 20,815.99, 31,234.24 and 9,721.07

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Solution

The fourth proportional to 20,815.99, 31,234.24 and 9,721.07 is: 14,586.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,815.99 : 31,234.24 = 9,721.07 : x
  2. Step 2: Convert to fraction form
    20,815.99/31,234.24 = 9,721.07/x
  3. Step 3: Cross multiply
    20,815.99x = 31,234.24 × 9,721.07
  4. Step 4: Simplify right side
    20,815.99x = 303,630,170.09
  5. Step 5: Solve for x
    x = 303,630,170.09/20,815.99
  6. Step 6: Final answer
    x = 14,586.39

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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.