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Finding the Fourth Proportional to 20,384.92, 28,119.26 and 12,819.28

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Solution

The fourth proportional to 20,384.92, 28,119.26 and 12,819.28 is: 17,683.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,384.92 : 28,119.26 = 12,819.28 : x
  2. Step 2: Convert to fraction form
    20,384.92/28,119.26 = 12,819.28/x
  3. Step 3: Cross multiply
    20,384.92x = 28,119.26 × 12,819.28
  4. Step 4: Simplify right side
    20,384.92x = 360,468,667.33
  5. Step 5: Solve for x
    x = 360,468,667.33/20,384.92
  6. Step 6: Final answer
    x = 17,683.10

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.