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Finding the Fourth Proportional to 20,639.84, 30,960.86 and 12,323.84

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Solution

The fourth proportional to 20,639.84, 30,960.86 and 12,323.84 is: 18,486.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,639.84 : 30,960.86 = 12,323.84 : x
  2. Step 2: Convert to fraction form
    20,639.84/30,960.86 = 12,323.84/x
  3. Step 3: Cross multiply
    20,639.84x = 30,960.86 × 12,323.84
  4. Step 4: Simplify right side
    20,639.84x = 381,556,684.90
  5. Step 5: Solve for x
    x = 381,556,684.90/20,639.84
  6. Step 6: Final answer
    x = 18,486.42

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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.