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Finding the Fourth Proportional to 3,395.70, 5,086.80 and 2,989.80

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Solution

The fourth proportional to 3,395.70, 5,086.80 and 2,989.80 is: 4,478.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,395.70 : 5,086.80 = 2,989.80 : x
  2. Step 2: Convert to fraction form
    3,395.70/5,086.80 = 2,989.80/x
  3. Step 3: Cross multiply
    3,395.70x = 5,086.80 × 2,989.80
  4. Step 4: Simplify right side
    3,395.70x = 15,208,514.64
  5. Step 5: Solve for x
    x = 15,208,514.64/3,395.70
  6. Step 6: Final answer
    x = 4,478.76

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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.