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Finding the Fourth Proportional to 3,201.80, 4,809.90 and 3,115.40

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Solution

The fourth proportional to 3,201.80, 4,809.90 and 3,115.40 is: 4,680.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,201.80 : 4,809.90 = 3,115.40 : x
  2. Step 2: Convert to fraction form
    3,201.80/4,809.90 = 3,115.40/x
  3. Step 3: Cross multiply
    3,201.80x = 4,809.90 × 3,115.40
  4. Step 4: Simplify right side
    3,201.80x = 14,984,762.46
  5. Step 5: Solve for x
    x = 14,984,762.46/3,201.80
  6. Step 6: Final answer
    x = 4,680.11

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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.