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Finding the Fourth Proportional to 20,490.84, 30,734.91 and 8,639.55

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Solution

The fourth proportional to 20,490.84, 30,734.91 and 8,639.55 is: 12,958.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,490.84 : 30,734.91 = 8,639.55 : x
  2. Step 2: Convert to fraction form
    20,490.84/30,734.91 = 8,639.55/x
  3. Step 3: Cross multiply
    20,490.84x = 30,734.91 × 8,639.55
  4. Step 4: Simplify right side
    20,490.84x = 265,535,791.69
  5. Step 5: Solve for x
    x = 265,535,791.69/20,490.84
  6. Step 6: Final answer
    x = 12,958.76

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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.