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Finding the Fourth Proportional to 671.07, 1,006.91 and 643.74

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Solution

The fourth proportional to 671.07, 1,006.91 and 643.74 is: 965.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    671.07 : 1,006.91 = 643.74 : x
  2. Step 2: Convert to fraction form
    671.07/1,006.91 = 643.74/x
  3. Step 3: Cross multiply
    671.07x = 1,006.91 × 643.74
  4. Step 4: Simplify right side
    671.07x = 648,188.24
  5. Step 5: Solve for x
    x = 648,188.24/671.07
  6. Step 6: Final answer
    x = 965.90

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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.