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Finding the Fourth Proportional to 18,806.40, 28,124.10 and 14,065.92

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Solution

The fourth proportional to 18,806.40, 28,124.10 and 14,065.92 is: 21,034.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,806.40 : 28,124.10 = 14,065.92 : x
  2. Step 2: Convert to fraction form
    18,806.40/28,124.10 = 14,065.92/x
  3. Step 3: Cross multiply
    18,806.40x = 28,124.10 × 14,065.92
  4. Step 4: Simplify right side
    18,806.40x = 395,591,340.67
  5. Step 5: Solve for x
    x = 395,591,340.67/18,806.40
  6. Step 6: Final answer
    x = 21,034.93

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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.