Home / 20,815.60-31,223.40-19,940.80

Finding the Fourth Proportional to 20,815.60, 31,223.40 and 19,940.80

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Solution

The fourth proportional to 20,815.60, 31,223.40 and 19,940.80 is: 29,911.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,815.60 : 31,223.40 = 19,940.80 : x
  2. Step 2: Convert to fraction form
    20,815.60/31,223.40 = 19,940.80/x
  3. Step 3: Cross multiply
    20,815.60x = 31,223.40 × 19,940.80
  4. Step 4: Simplify right side
    20,815.60x = 622,619,574.72
  5. Step 5: Solve for x
    x = 622,619,574.72/20,815.60
  6. Step 6: Final answer
    x = 29,911.20

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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.