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Finding the Fourth Proportional to 18,939.20, 28,395.84 and 8,545.28

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Solution

The fourth proportional to 18,939.20, 28,395.84 and 8,545.28 is: 12,812.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,939.20 : 28,395.84 = 8,545.28 : x
  2. Step 2: Convert to fraction form
    18,939.20/28,395.84 = 8,545.28/x
  3. Step 3: Cross multiply
    18,939.20x = 28,395.84 × 8,545.28
  4. Step 4: Simplify right side
    18,939.20x = 242,650,403.64
  5. Step 5: Solve for x
    x = 242,650,403.64/18,939.20
  6. Step 6: Final answer
    x = 12,812.07

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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.