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Finding the Fourth Proportional to 19,121.69, 28,672.69 and 8,582.68

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Solution

The fourth proportional to 19,121.69, 28,672.69 and 8,582.68 is: 12,869.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,121.69 : 28,672.69 = 8,582.68 : x
  2. Step 2: Convert to fraction form
    19,121.69/28,672.69 = 8,582.68/x
  3. Step 3: Cross multiply
    19,121.69x = 28,672.69 × 8,582.68
  4. Step 4: Simplify right side
    19,121.69x = 246,088,472.84
  5. Step 5: Solve for x
    x = 246,088,472.84/19,121.69
  6. Step 6: Final answer
    x = 12,869.60

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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.