Home / 20,781.60-31,172.52-6,930.56

Finding the Fourth Proportional to 20,781.60, 31,172.52 and 6,930.56

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Solution

The fourth proportional to 20,781.60, 31,172.52 and 6,930.56 is: 10,395.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,781.60 : 31,172.52 = 6,930.56 : x
  2. Step 2: Convert to fraction form
    20,781.60/31,172.52 = 6,930.56/x
  3. Step 3: Cross multiply
    20,781.60x = 31,172.52 × 6,930.56
  4. Step 4: Simplify right side
    20,781.60x = 216,043,020.21
  5. Step 5: Solve for x
    x = 216,043,020.21/20,781.60
  6. Step 6: Final answer
    x = 10,395.88

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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.