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Finding the Fourth Proportional to 671.40, 1,007.96 and 517.43

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Solution

The fourth proportional to 671.40, 1,007.96 and 517.43 is: 776.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    671.40 : 1,007.96 = 517.43 : x
  2. Step 2: Convert to fraction form
    671.40/1,007.96 = 517.43/x
  3. Step 3: Cross multiply
    671.40x = 1,007.96 × 517.43
  4. Step 4: Simplify right side
    671.40x = 521,548.74
  5. Step 5: Solve for x
    x = 521,548.74/671.40
  6. Step 6: Final answer
    x = 776.81

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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.