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Finding the Fourth Proportional to 671.85, 1,007.68 and 239.31

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Solution

The fourth proportional to 671.85, 1,007.68 and 239.31 is: 358.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    671.85 : 1,007.68 = 239.31 : x
  2. Step 2: Convert to fraction form
    671.85/1,007.68 = 239.31/x
  3. Step 3: Cross multiply
    671.85x = 1,007.68 × 239.31
  4. Step 4: Simplify right side
    671.85x = 241,147.90
  5. Step 5: Solve for x
    x = 241,147.90/671.85
  6. Step 6: Final answer
    x = 358.93

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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.