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Finding the Fourth Proportional to 905.28, 1,248.82 and 625.80

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Solution

The fourth proportional to 905.28, 1,248.82 and 625.80 is: 863.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.28 : 1,248.82 = 625.80 : x
  2. Step 2: Convert to fraction form
    905.28/1,248.82 = 625.80/x
  3. Step 3: Cross multiply
    905.28x = 1,248.82 × 625.80
  4. Step 4: Simplify right side
    905.28x = 781,511.56
  5. Step 5: Solve for x
    x = 781,511.56/905.28
  6. Step 6: Final answer
    x = 863.28

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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.