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Finding the Fourth Proportional to 18,863.10, 28,246.05 and 13,905.90

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Solution

The fourth proportional to 18,863.10, 28,246.05 and 13,905.90 is: 20,823.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,863.10 : 28,246.05 = 13,905.90 : x
  2. Step 2: Convert to fraction form
    18,863.10/28,246.05 = 13,905.90/x
  3. Step 3: Cross multiply
    18,863.10x = 28,246.05 × 13,905.90
  4. Step 4: Simplify right side
    18,863.10x = 392,786,746.70
  5. Step 5: Solve for x
    x = 392,786,746.70/18,863.10
  6. Step 6: Final answer
    x = 20,823.02

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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.