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Finding the Fourth Proportional to 20,490.63, 30,740.80 and 6,639.63

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Solution

The fourth proportional to 20,490.63, 30,740.80 and 6,639.63 is: 9,961.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,490.63 : 30,740.80 = 6,639.63 : x
  2. Step 2: Convert to fraction form
    20,490.63/30,740.80 = 6,639.63/x
  3. Step 3: Cross multiply
    20,490.63x = 30,740.80 × 6,639.63
  4. Step 4: Simplify right side
    20,490.63x = 204,107,537.90
  5. Step 5: Solve for x
    x = 204,107,537.90/20,490.63
  6. Step 6: Final answer
    x = 9,961.02

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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.