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Finding the Fourth Proportional to 2,169.88, 3,255.30 and 631

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Solution

The fourth proportional to 2,169.88, 3,255.30 and 631 is: 946.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,169.88 : 3,255.30 = 631 : x
  2. Step 2: Convert to fraction form
    2,169.88/3,255.30 = 631/x
  3. Step 3: Cross multiply
    2,169.88x = 3,255.30 × 631
  4. Step 4: Simplify right side
    2,169.88x = 2,054,094.30
  5. Step 5: Solve for x
    x = 2,054,094.30/2,169.88
  6. Step 6: Final answer
    x = 946.64

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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.