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Finding the Fourth Proportional to 18,921.20, 28,401.84 and 10,608.17

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Solution

The fourth proportional to 18,921.20, 28,401.84 and 10,608.17 is: 15,923.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,921.20 : 28,401.84 = 10,608.17 : x
  2. Step 2: Convert to fraction form
    18,921.20/28,401.84 = 10,608.17/x
  3. Step 3: Cross multiply
    18,921.20x = 28,401.84 × 10,608.17
  4. Step 4: Simplify right side
    18,921.20x = 301,291,405.02
  5. Step 5: Solve for x
    x = 301,291,405.02/18,921.20
  6. Step 6: Final answer
    x = 15,923.49

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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.