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Finding the Fourth Proportional to 913.67, 1,371.06 and 426.75

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Solution

The fourth proportional to 913.67, 1,371.06 and 426.75 is: 640.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    913.67 : 1,371.06 = 426.75 : x
  2. Step 2: Convert to fraction form
    913.67/1,371.06 = 426.75/x
  3. Step 3: Cross multiply
    913.67x = 1,371.06 × 426.75
  4. Step 4: Simplify right side
    913.67x = 585,097.72
  5. Step 5: Solve for x
    x = 585,097.72/913.67
  6. Step 6: Final answer
    x = 640.39

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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.