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Finding the Fourth Proportional to 671.38, 925.72 and 629.86

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Solution

The fourth proportional to 671.38, 925.72 and 629.86 is: 868.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    671.38 : 925.72 = 629.86 : x
  2. Step 2: Convert to fraction form
    671.38/925.72 = 629.86/x
  3. Step 3: Cross multiply
    671.38x = 925.72 × 629.86
  4. Step 4: Simplify right side
    671.38x = 583,070.85
  5. Step 5: Solve for x
    x = 583,070.85/671.38
  6. Step 6: Final answer
    x = 868.47

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.