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Finding the Fourth Proportional to 905.41, 1,249.18 and 625.66

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Solution

The fourth proportional to 905.41, 1,249.18 and 625.66 is: 863.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.41 : 1,249.18 = 625.66 : x
  2. Step 2: Convert to fraction form
    905.41/1,249.18 = 625.66/x
  3. Step 3: Cross multiply
    905.41x = 1,249.18 × 625.66
  4. Step 4: Simplify right side
    905.41x = 781,561.96
  5. Step 5: Solve for x
    x = 781,561.96/905.41
  6. Step 6: Final answer
    x = 863.21

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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.