Home / 18,921.28-28,385.36-7,821.94

Finding the Fourth Proportional to 18,921.28, 28,385.36 and 7,821.94

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Solution

The fourth proportional to 18,921.28, 28,385.36 and 7,821.94 is: 11,734.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,921.28 : 28,385.36 = 7,821.94 : x
  2. Step 2: Convert to fraction form
    18,921.28/28,385.36 = 7,821.94/x
  3. Step 3: Cross multiply
    18,921.28x = 28,385.36 × 7,821.94
  4. Step 4: Simplify right side
    18,921.28x = 222,028,401.76
  5. Step 5: Solve for x
    x = 222,028,401.76/18,921.28
  6. Step 6: Final answer
    x = 11,734.33

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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.