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Finding the Fourth Proportional to 669.53, 1,003.98 and 258.86

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Solution

The fourth proportional to 669.53, 1,003.98 and 258.86 is: 388.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    669.53 : 1,003.98 = 258.86 : x
  2. Step 2: Convert to fraction form
    669.53/1,003.98 = 258.86/x
  3. Step 3: Cross multiply
    669.53x = 1,003.98 × 258.86
  4. Step 4: Simplify right side
    669.53x = 259,890.26
  5. Step 5: Solve for x
    x = 259,890.26/669.53
  6. Step 6: Final answer
    x = 388.17

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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.