Home / 31,480.85-43,429.79-20,711.88

Finding the Fourth Proportional to 31,480.85, 43,429.79 and 20,711.88

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Solution

The fourth proportional to 31,480.85, 43,429.79 and 20,711.88 is: 28,573.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,480.85 : 43,429.79 = 20,711.88 : x
  2. Step 2: Convert to fraction form
    31,480.85/43,429.79 = 20,711.88/x
  3. Step 3: Cross multiply
    31,480.85x = 43,429.79 × 20,711.88
  4. Step 4: Simplify right side
    31,480.85x = 899,512,495.35
  5. Step 5: Solve for x
    x = 899,512,495.35/31,480.85
  6. Step 6: Final answer
    x = 28,573.33

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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.