Home / 31,721.82-43,756.31-20,406.07

Finding the Fourth Proportional to 31,721.82, 43,756.31 and 20,406.07

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Solution

The fourth proportional to 31,721.82, 43,756.31 and 20,406.07 is: 28,147.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,721.82 : 43,756.31 = 20,406.07 : x
  2. Step 2: Convert to fraction form
    31,721.82/43,756.31 = 20,406.07/x
  3. Step 3: Cross multiply
    31,721.82x = 43,756.31 × 20,406.07
  4. Step 4: Simplify right side
    31,721.82x = 892,894,003.99
  5. Step 5: Solve for x
    x = 892,894,003.99/31,721.82
  6. Step 6: Final answer
    x = 28,147.63

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.