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Finding the Fourth Proportional to 1,388.70, 2,082.42 and 414.63

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Solution

The fourth proportional to 1,388.70, 2,082.42 and 414.63 is: 621.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,388.70 : 2,082.42 = 414.63 : x
  2. Step 2: Convert to fraction form
    1,388.70/2,082.42 = 414.63/x
  3. Step 3: Cross multiply
    1,388.70x = 2,082.42 × 414.63
  4. Step 4: Simplify right side
    1,388.70x = 863,433.80
  5. Step 5: Solve for x
    x = 863,433.80/1,388.70
  6. Step 6: Final answer
    x = 621.76

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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.