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Finding the Fourth Proportional to 18,902.79, 28,363.41 and 13,391.55

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Solution

The fourth proportional to 18,902.79, 28,363.41 and 13,391.55 is: 20,093.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,902.79 : 28,363.41 = 13,391.55 : x
  2. Step 2: Convert to fraction form
    18,902.79/28,363.41 = 13,391.55/x
  3. Step 3: Cross multiply
    18,902.79x = 28,363.41 × 13,391.55
  4. Step 4: Simplify right side
    18,902.79x = 379,830,023.19
  5. Step 5: Solve for x
    x = 379,830,023.19/18,902.79
  6. Step 6: Final answer
    x = 20,093.86

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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.