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Finding the Fourth Proportional to 18,918.94, 28,348.98 and 7,225.78

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Solution

The fourth proportional to 18,918.94, 28,348.98 and 7,225.78 is: 10,827.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,918.94 : 28,348.98 = 7,225.78 : x
  2. Step 2: Convert to fraction form
    18,918.94/28,348.98 = 7,225.78/x
  3. Step 3: Cross multiply
    18,918.94x = 28,348.98 × 7,225.78
  4. Step 4: Simplify right side
    18,918.94x = 204,843,492.70
  5. Step 5: Solve for x
    x = 204,843,492.70/18,918.94
  6. Step 6: Final answer
    x = 10,827.43

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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.