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Finding the Fourth Proportional to 1,390.43, 2,085.71 and 416.44

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Solution

The fourth proportional to 1,390.43, 2,085.71 and 416.44 is: 624.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,390.43 : 2,085.71 = 416.44 : x
  2. Step 2: Convert to fraction form
    1,390.43/2,085.71 = 416.44/x
  3. Step 3: Cross multiply
    1,390.43x = 2,085.71 × 416.44
  4. Step 4: Simplify right side
    1,390.43x = 868,568.90
  5. Step 5: Solve for x
    x = 868,568.90/1,390.43
  6. Step 6: Final answer
    x = 624.68

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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.