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Finding the Fourth Proportional to 20,070, 30,105 and 5,478

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Solution

The fourth proportional to 20,070, 30,105 and 5,478 is: 8,217

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,070 : 30,105 = 5,478 : x
  2. Step 2: Convert to fraction form
    20,070/30,105 = 5,478/x
  3. Step 3: Cross multiply
    20,070x = 30,105 × 5,478
  4. Step 4: Simplify right side
    20,070x = 164,915,190
  5. Step 5: Solve for x
    x = 164,915,190/20,070
  6. Step 6: Final answer
    x = 8,217

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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.