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Finding the Fourth Proportional to 669.88, 1,003.18 and 425.68

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Solution

The fourth proportional to 669.88, 1,003.18 and 425.68 is: 637.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    669.88 : 1,003.18 = 425.68 : x
  2. Step 2: Convert to fraction form
    669.88/1,003.18 = 425.68/x
  3. Step 3: Cross multiply
    669.88x = 1,003.18 × 425.68
  4. Step 4: Simplify right side
    669.88x = 427,033.66
  5. Step 5: Solve for x
    x = 427,033.66/669.88
  6. Step 6: Final answer
    x = 637.48

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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.