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Finding the Fourth Proportional to 929.39, 1,394.12 and 668.66

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Solution

The fourth proportional to 929.39, 1,394.12 and 668.66 is: 1,003.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    929.39 : 1,394.12 = 668.66 : x
  2. Step 2: Convert to fraction form
    929.39/1,394.12 = 668.66/x
  3. Step 3: Cross multiply
    929.39x = 1,394.12 × 668.66
  4. Step 4: Simplify right side
    929.39x = 932,197.44
  5. Step 5: Solve for x
    x = 932,197.44/929.39
  6. Step 6: Final answer
    x = 1,003.03

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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.