Home / 20,425.05-28,179.18-13,355.55

Finding the Fourth Proportional to 20,425.05, 28,179.18 and 13,355.55

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Solution

The fourth proportional to 20,425.05, 28,179.18 and 13,355.55 is: 18,425.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,425.05 : 28,179.18 = 13,355.55 : x
  2. Step 2: Convert to fraction form
    20,425.05/28,179.18 = 13,355.55/x
  3. Step 3: Cross multiply
    20,425.05x = 28,179.18 × 13,355.55
  4. Step 4: Simplify right side
    20,425.05x = 376,348,447.45
  5. Step 5: Solve for x
    x = 376,348,447.45/20,425.05
  6. Step 6: Final answer
    x = 18,425.83

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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.