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Finding the Fourth Proportional to 667.80, 919.80 and 634.86

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Solution

The fourth proportional to 667.80, 919.80 and 634.86 is: 874.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.80 : 919.80 = 634.86 : x
  2. Step 2: Convert to fraction form
    667.80/919.80 = 634.86/x
  3. Step 3: Cross multiply
    667.80x = 919.80 × 634.86
  4. Step 4: Simplify right side
    667.80x = 583,944.23
  5. Step 5: Solve for x
    x = 583,944.23/667.80
  6. Step 6: Final answer
    x = 874.43

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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.