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Finding the Fourth Proportional to 1,389.97, 2,084.96 and 416.75

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Solution

The fourth proportional to 1,389.97, 2,084.96 and 416.75 is: 625.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,389.97 : 2,084.96 = 416.75 : x
  2. Step 2: Convert to fraction form
    1,389.97/2,084.96 = 416.75/x
  3. Step 3: Cross multiply
    1,389.97x = 2,084.96 × 416.75
  4. Step 4: Simplify right side
    1,389.97x = 868,910.21
  5. Step 5: Solve for x
    x = 868,910.21/1,389.97
  6. Step 6: Final answer
    x = 625.13

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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.