Home / 20,969.28-31,453.92-18,889.20

Finding the Fourth Proportional to 20,969.28, 31,453.92 and 18,889.20

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Solution

The fourth proportional to 20,969.28, 31,453.92 and 18,889.20 is: 28,333.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,969.28 : 31,453.92 = 18,889.20 : x
  2. Step 2: Convert to fraction form
    20,969.28/31,453.92 = 18,889.20/x
  3. Step 3: Cross multiply
    20,969.28x = 31,453.92 × 18,889.20
  4. Step 4: Simplify right side
    20,969.28x = 594,139,385.66
  5. Step 5: Solve for x
    x = 594,139,385.66/20,969.28
  6. Step 6: Final answer
    x = 28,333.80

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.