Home / 31,721.14-43,749.92-20,391.80

Finding the Fourth Proportional to 31,721.14, 43,749.92 and 20,391.80

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Solution

The fourth proportional to 31,721.14, 43,749.92 and 20,391.80 is: 28,124.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,721.14 : 43,749.92 = 20,391.80 : x
  2. Step 2: Convert to fraction form
    31,721.14/43,749.92 = 20,391.80/x
  3. Step 3: Cross multiply
    31,721.14x = 43,749.92 × 20,391.80
  4. Step 4: Simplify right side
    31,721.14x = 892,139,618.66
  5. Step 5: Solve for x
    x = 892,139,618.66/31,721.14
  6. Step 6: Final answer
    x = 28,124.45

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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.