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Finding the Fourth Proportional to 20,616.20, 30,921.76 and 8,774.74

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Solution

The fourth proportional to 20,616.20, 30,921.76 and 8,774.74 is: 13,161.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,616.20 : 30,921.76 = 8,774.74 : x
  2. Step 2: Convert to fraction form
    20,616.20/30,921.76 = 8,774.74/x
  3. Step 3: Cross multiply
    20,616.20x = 30,921.76 × 8,774.74
  4. Step 4: Simplify right side
    20,616.20x = 271,330,404.34
  5. Step 5: Solve for x
    x = 271,330,404.34/20,616.20
  6. Step 6: Final answer
    x = 13,161.03

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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.