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Finding the Fourth Proportional to 913.97, 1,371.19 and 426.45

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Solution

The fourth proportional to 913.97, 1,371.19 and 426.45 is: 639.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    913.97 : 1,371.19 = 426.45 : x
  2. Step 2: Convert to fraction form
    913.97/1,371.19 = 426.45/x
  3. Step 3: Cross multiply
    913.97x = 1,371.19 × 426.45
  4. Step 4: Simplify right side
    913.97x = 584,743.98
  5. Step 5: Solve for x
    x = 584,743.98/913.97
  6. Step 6: Final answer
    x = 639.78

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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.