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Finding the Fourth Proportional to 1,003.39, 1,385.48 and 667.62

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Solution

The fourth proportional to 1,003.39, 1,385.48 and 667.62 is: 921.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,003.39 : 1,385.48 = 667.62 : x
  2. Step 2: Convert to fraction form
    1,003.39/1,385.48 = 667.62/x
  3. Step 3: Cross multiply
    1,003.39x = 1,385.48 × 667.62
  4. Step 4: Simplify right side
    1,003.39x = 924,974.16
  5. Step 5: Solve for x
    x = 924,974.16/1,003.39
  6. Step 6: Final answer
    x = 921.85

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.