Home / 20,772.47-28,665.65-11,819.78

Finding the Fourth Proportional to 20,772.47, 28,665.65 and 11,819.78

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Solution

The fourth proportional to 20,772.47, 28,665.65 and 11,819.78 is: 16,311.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,772.47 : 28,665.65 = 11,819.78 : x
  2. Step 2: Convert to fraction form
    20,772.47/28,665.65 = 11,819.78/x
  3. Step 3: Cross multiply
    20,772.47x = 28,665.65 × 11,819.78
  4. Step 4: Simplify right side
    20,772.47x = 338,821,617.46
  5. Step 5: Solve for x
    x = 338,821,617.46/20,772.47
  6. Step 6: Final answer
    x = 16,311.09

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.