Home / 20,991.85-31,323.31-18,785.41

Finding the Fourth Proportional to 20,991.85, 31,323.31 and 18,785.41

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Solution

The fourth proportional to 20,991.85, 31,323.31 and 18,785.41 is: 28,030.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,991.85 : 31,323.31 = 18,785.41 : x
  2. Step 2: Convert to fraction form
    20,991.85/31,323.31 = 18,785.41/x
  3. Step 3: Cross multiply
    20,991.85x = 31,323.31 × 18,785.41
  4. Step 4: Simplify right side
    20,991.85x = 588,421,220.91
  5. Step 5: Solve for x
    x = 588,421,220.91/20,991.85
  6. Step 6: Final answer
    x = 28,030.94

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.