Home / 20,890.80-31,344.40-9,195.80

Finding the Fourth Proportional to 20,890.80, 31,344.40 and 9,195.80

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Solution

The fourth proportional to 20,890.80, 31,344.40 and 9,195.80 is: 13,797.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,890.80 : 31,344.40 = 9,195.80 : x
  2. Step 2: Convert to fraction form
    20,890.80/31,344.40 = 9,195.80/x
  3. Step 3: Cross multiply
    20,890.80x = 31,344.40 × 9,195.80
  4. Step 4: Simplify right side
    20,890.80x = 288,236,833.52
  5. Step 5: Solve for x
    x = 288,236,833.52/20,890.80
  6. Step 6: Final answer
    x = 13,797.31

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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.