Home / 31,581.47-43,589.76-20,828.28

Finding the Fourth Proportional to 31,581.47, 43,589.76 and 20,828.28

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Solution

The fourth proportional to 31,581.47, 43,589.76 and 20,828.28 is: 28,747.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,581.47 : 43,589.76 = 20,828.28 : x
  2. Step 2: Convert to fraction form
    31,581.47/43,589.76 = 20,828.28/x
  3. Step 3: Cross multiply
    31,581.47x = 43,589.76 × 20,828.28
  4. Step 4: Simplify right side
    31,581.47x = 907,899,811.77
  5. Step 5: Solve for x
    x = 907,899,811.77/31,581.47
  6. Step 6: Final answer
    x = 28,747.86

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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.