Home / 20,969.20-31,453.80-7,118.32

Finding the Fourth Proportional to 20,969.20, 31,453.80 and 7,118.32

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Solution

The fourth proportional to 20,969.20, 31,453.80 and 7,118.32 is: 10,677.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,969.20 : 31,453.80 = 7,118.32 : x
  2. Step 2: Convert to fraction form
    20,969.20/31,453.80 = 7,118.32/x
  3. Step 3: Cross multiply
    20,969.20x = 31,453.80 × 7,118.32
  4. Step 4: Simplify right side
    20,969.20x = 223,898,213.62
  5. Step 5: Solve for x
    x = 223,898,213.62/20,969.20
  6. Step 6: Final answer
    x = 10,677.48

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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.