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Finding the Fourth Proportional to 18,685.89, 28,042.74 and 8,828.19

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Solution

The fourth proportional to 18,685.89, 28,042.74 and 8,828.19 is: 13,248.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,685.89 : 28,042.74 = 8,828.19 : x
  2. Step 2: Convert to fraction form
    18,685.89/28,042.74 = 8,828.19/x
  3. Step 3: Cross multiply
    18,685.89x = 28,042.74 × 8,828.19
  4. Step 4: Simplify right side
    18,685.89x = 247,566,636.84
  5. Step 5: Solve for x
    x = 247,566,636.84/18,685.89
  6. Step 6: Final answer
    x = 13,248.85

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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.