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Finding the Fourth Proportional to 20,613.82, 30,916.84 and 8,765.40

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Solution

The fourth proportional to 20,613.82, 30,916.84 and 8,765.40 is: 13,146.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,613.82 : 30,916.84 = 8,765.40 : x
  2. Step 2: Convert to fraction form
    20,613.82/30,916.84 = 8,765.40/x
  3. Step 3: Cross multiply
    20,613.82x = 30,916.84 × 8,765.40
  4. Step 4: Simplify right side
    20,613.82x = 270,998,469.34
  5. Step 5: Solve for x
    x = 270,998,469.34/20,613.82
  6. Step 6: Final answer
    x = 13,146.45

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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.