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Finding the Fourth Proportional to 669.21, 1,003.82 and 625.47

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Solution

The fourth proportional to 669.21, 1,003.82 and 625.47 is: 938.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    669.21 : 1,003.82 = 625.47 : x
  2. Step 2: Convert to fraction form
    669.21/1,003.82 = 625.47/x
  3. Step 3: Cross multiply
    669.21x = 1,003.82 × 625.47
  4. Step 4: Simplify right side
    669.21x = 627,856.17
  5. Step 5: Solve for x
    x = 627,856.17/669.21
  6. Step 6: Final answer
    x = 938.21

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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.