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Finding the Fourth Proportional to 2,170, 3,255.54 and 631

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Solution

The fourth proportional to 2,170, 3,255.54 and 631 is: 946.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,170 : 3,255.54 = 631 : x
  2. Step 2: Convert to fraction form
    2,170/3,255.54 = 631/x
  3. Step 3: Cross multiply
    2,170x = 3,255.54 × 631
  4. Step 4: Simplify right side
    2,170x = 2,054,245.74
  5. Step 5: Solve for x
    x = 2,054,245.74/2,170
  6. Step 6: Final answer
    x = 946.66

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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.