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Finding the Fourth Proportional to 1,388.25, 2,081.97 and 414.12

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Solution

The fourth proportional to 1,388.25, 2,081.97 and 414.12 is: 621.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,388.25 : 2,081.97 = 414.12 : x
  2. Step 2: Convert to fraction form
    1,388.25/2,081.97 = 414.12/x
  3. Step 3: Cross multiply
    1,388.25x = 2,081.97 × 414.12
  4. Step 4: Simplify right side
    1,388.25x = 862,185.42
  5. Step 5: Solve for x
    x = 862,185.42/1,388.25
  6. Step 6: Final answer
    x = 621.06

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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.