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Finding the Fourth Proportional to 3,479.42, 5,218.99 and 1,398.80

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Solution

The fourth proportional to 3,479.42, 5,218.99 and 1,398.80 is: 2,098.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,479.42 : 5,218.99 = 1,398.80 : x
  2. Step 2: Convert to fraction form
    3,479.42/5,218.99 = 1,398.80/x
  3. Step 3: Cross multiply
    3,479.42x = 5,218.99 × 1,398.80
  4. Step 4: Simplify right side
    3,479.42x = 7,300,323.21
  5. Step 5: Solve for x
    x = 7,300,323.21/3,479.42
  6. Step 6: Final answer
    x = 2,098.14

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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.