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Finding the Fourth Proportional to 669.23, 1,003.91 and 258.71

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Solution

The fourth proportional to 669.23, 1,003.91 and 258.71 is: 388.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    669.23 : 1,003.91 = 258.71 : x
  2. Step 2: Convert to fraction form
    669.23/1,003.91 = 258.71/x
  3. Step 3: Cross multiply
    669.23x = 1,003.91 × 258.71
  4. Step 4: Simplify right side
    669.23x = 259,721.56
  5. Step 5: Solve for x
    x = 259,721.56/669.23
  6. Step 6: Final answer
    x = 388.09

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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.