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Finding the Fourth Proportional to 671.91, 1,007.71 and 379.54

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Solution

The fourth proportional to 671.91, 1,007.71 and 379.54 is: 569.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    671.91 : 1,007.71 = 379.54 : x
  2. Step 2: Convert to fraction form
    671.91/1,007.71 = 379.54/x
  3. Step 3: Cross multiply
    671.91x = 1,007.71 × 379.54
  4. Step 4: Simplify right side
    671.91x = 382,466.25
  5. Step 5: Solve for x
    x = 382,466.25/671.91
  6. Step 6: Final answer
    x = 569.22

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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.