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Finding the Fourth Proportional to 18,945.84, 28,419 and 7,259.76

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Solution

The fourth proportional to 18,945.84, 28,419 and 7,259.76 is: 10,889.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,945.84 : 28,419 = 7,259.76 : x
  2. Step 2: Convert to fraction form
    18,945.84/28,419 = 7,259.76/x
  3. Step 3: Cross multiply
    18,945.84x = 28,419 × 7,259.76
  4. Step 4: Simplify right side
    18,945.84x = 206,315,119.44
  5. Step 5: Solve for x
    x = 206,315,119.44/18,945.84
  6. Step 6: Final answer
    x = 10,889.73

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Double scale
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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.