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Finding the Fourth Proportional to 20,645.80, 30,966.16 and 12,217.32

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Solution

The fourth proportional to 20,645.80, 30,966.16 and 12,217.32 is: 18,324.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,645.80 : 30,966.16 = 12,217.32 : x
  2. Step 2: Convert to fraction form
    20,645.80/30,966.16 = 12,217.32/x
  3. Step 3: Cross multiply
    20,645.80x = 30,966.16 × 12,217.32
  4. Step 4: Simplify right side
    20,645.80x = 378,323,485.89
  5. Step 5: Solve for x
    x = 378,323,485.89/20,645.80
  6. Step 6: Final answer
    x = 18,324.48

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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.