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Finding the Fourth Proportional to 19,308.40, 28,976.43 and 8,222.86

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Solution

The fourth proportional to 19,308.40, 28,976.43 and 8,222.86 is: 12,340.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,308.40 : 28,976.43 = 8,222.86 : x
  2. Step 2: Convert to fraction form
    19,308.40/28,976.43 = 8,222.86/x
  3. Step 3: Cross multiply
    19,308.40x = 28,976.43 × 8,222.86
  4. Step 4: Simplify right side
    19,308.40x = 238,269,127.19
  5. Step 5: Solve for x
    x = 238,269,127.19/19,308.40
  6. Step 6: Final answer
    x = 12,340.18

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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.