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Finding the Fourth Proportional to 1,388.62, 2,082.96 and 414.74

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Solution

The fourth proportional to 1,388.62, 2,082.96 and 414.74 is: 622.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,388.62 : 2,082.96 = 414.74 : x
  2. Step 2: Convert to fraction form
    1,388.62/2,082.96 = 414.74/x
  3. Step 3: Cross multiply
    1,388.62x = 2,082.96 × 414.74
  4. Step 4: Simplify right side
    1,388.62x = 863,886.83
  5. Step 5: Solve for x
    x = 863,886.83/1,388.62
  6. Step 6: Final answer
    x = 622.12

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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.