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Finding the Fourth Proportional to 20,435.78, 30,628.02 and 8,735.24

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Solution

The fourth proportional to 20,435.78, 30,628.02 and 8,735.24 is: 13,091.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,435.78 : 30,628.02 = 8,735.24 : x
  2. Step 2: Convert to fraction form
    20,435.78/30,628.02 = 8,735.24/x
  3. Step 3: Cross multiply
    20,435.78x = 30,628.02 × 8,735.24
  4. Step 4: Simplify right side
    20,435.78x = 267,543,105.42
  5. Step 5: Solve for x
    x = 267,543,105.42/20,435.78
  6. Step 6: Final answer
    x = 13,091.90

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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.