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Finding the Fourth Proportional to 1,390.44, 2,086 and 416.54

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Solution

The fourth proportional to 1,390.44, 2,086 and 416.54 is: 624.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,390.44 : 2,086 = 416.54 : x
  2. Step 2: Convert to fraction form
    1,390.44/2,086 = 416.54/x
  3. Step 3: Cross multiply
    1,390.44x = 2,086 × 416.54
  4. Step 4: Simplify right side
    1,390.44x = 868,902.44
  5. Step 5: Solve for x
    x = 868,902.44/1,390.44
  6. Step 6: Final answer
    x = 624.91

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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.