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Finding the Fourth Proportional to 20,734.90, 28,614.92 and 11,783.90

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Solution

The fourth proportional to 20,734.90, 28,614.92 and 11,783.90 is: 16,262.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,734.90 : 28,614.92 = 11,783.90 : x
  2. Step 2: Convert to fraction form
    20,734.90/28,614.92 = 11,783.90/x
  3. Step 3: Cross multiply
    20,734.90x = 28,614.92 × 11,783.90
  4. Step 4: Simplify right side
    20,734.90x = 337,195,355.79
  5. Step 5: Solve for x
    x = 337,195,355.79/20,734.90
  6. Step 6: Final answer
    x = 16,262.21

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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.