Home / 20,772.78-31,159.14-5,190.42

Finding the Fourth Proportional to 20,772.78, 31,159.14 and 5,190.42

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Solution

The fourth proportional to 20,772.78, 31,159.14 and 5,190.42 is: 7,785.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,772.78 : 31,159.14 = 5,190.42 : x
  2. Step 2: Convert to fraction form
    20,772.78/31,159.14 = 5,190.42/x
  3. Step 3: Cross multiply
    20,772.78x = 31,159.14 × 5,190.42
  4. Step 4: Simplify right side
    20,772.78x = 161,729,023.44
  5. Step 5: Solve for x
    x = 161,729,023.44/20,772.78
  6. Step 6: Final answer
    x = 7,785.62

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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.