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Finding the Fourth Proportional to 667.38, 1,005.99 and 611.91

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Solution

The fourth proportional to 667.38, 1,005.99 and 611.91 is: 922.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.38 : 1,005.99 = 611.91 : x
  2. Step 2: Convert to fraction form
    667.38/1,005.99 = 611.91/x
  3. Step 3: Cross multiply
    667.38x = 1,005.99 × 611.91
  4. Step 4: Simplify right side
    667.38x = 615,575.34
  5. Step 5: Solve for x
    x = 615,575.34/667.38
  6. Step 6: Final answer
    x = 922.38

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.