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Finding the Fourth Proportional to 667.15, 1,001.19 and 393.41

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Solution

The fourth proportional to 667.15, 1,001.19 and 393.41 is: 590.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.15 : 1,001.19 = 393.41 : x
  2. Step 2: Convert to fraction form
    667.15/1,001.19 = 393.41/x
  3. Step 3: Cross multiply
    667.15x = 1,001.19 × 393.41
  4. Step 4: Simplify right side
    667.15x = 393,878.16
  5. Step 5: Solve for x
    x = 393,878.16/667.15
  6. Step 6: Final answer
    x = 590.39

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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.