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Finding the Fourth Proportional to 12,409.20, 18,565.20 and 8,035.20

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Solution

The fourth proportional to 12,409.20, 18,565.20 and 8,035.20 is: 12,021.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,409.20 : 18,565.20 = 8,035.20 : x
  2. Step 2: Convert to fraction form
    12,409.20/18,565.20 = 8,035.20/x
  3. Step 3: Cross multiply
    12,409.20x = 18,565.20 × 8,035.20
  4. Step 4: Simplify right side
    12,409.20x = 149,175,095.04
  5. Step 5: Solve for x
    x = 149,175,095.04/12,409.20
  6. Step 6: Final answer
    x = 12,021.33

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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.