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Finding the Fourth Proportional to 1,785.25, 2,678.42 and 631

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Solution

The fourth proportional to 1,785.25, 2,678.42 and 631 is: 946.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,785.25 : 2,678.42 = 631 : x
  2. Step 2: Convert to fraction form
    1,785.25/2,678.42 = 631/x
  3. Step 3: Cross multiply
    1,785.25x = 2,678.42 × 631
  4. Step 4: Simplify right side
    1,785.25x = 1,690,083.02
  5. Step 5: Solve for x
    x = 1,690,083.02/1,785.25
  6. Step 6: Final answer
    x = 946.69

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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.