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Finding the Fourth Proportional to 4,892.70, 7,340.40 and 2,120.70

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Solution

The fourth proportional to 4,892.70, 7,340.40 and 2,120.70 is: 3,181.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,892.70 : 7,340.40 = 2,120.70 : x
  2. Step 2: Convert to fraction form
    4,892.70/7,340.40 = 2,120.70/x
  3. Step 3: Cross multiply
    4,892.70x = 7,340.40 × 2,120.70
  4. Step 4: Simplify right side
    4,892.70x = 15,566,786.28
  5. Step 5: Solve for x
    x = 15,566,786.28/4,892.70
  6. Step 6: Final answer
    x = 3,181.64

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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.