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Finding the Fourth Proportional to 3,260.80, 4,892.40 and 3,140.80

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Solution

The fourth proportional to 3,260.80, 4,892.40 and 3,140.80 is: 4,712.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,260.80 : 4,892.40 = 3,140.80 : x
  2. Step 2: Convert to fraction form
    3,260.80/4,892.40 = 3,140.80/x
  3. Step 3: Cross multiply
    3,260.80x = 4,892.40 × 3,140.80
  4. Step 4: Simplify right side
    3,260.80x = 15,366,049.92
  5. Step 5: Solve for x
    x = 15,366,049.92/3,260.80
  6. Step 6: Final answer
    x = 4,712.36

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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.