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Finding the Fourth Proportional to 913.78, 1,370.87 and 426.56

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Solution

The fourth proportional to 913.78, 1,370.87 and 426.56 is: 639.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    913.78 : 1,370.87 = 426.56 : x
  2. Step 2: Convert to fraction form
    913.78/1,370.87 = 426.56/x
  3. Step 3: Cross multiply
    913.78x = 1,370.87 × 426.56
  4. Step 4: Simplify right side
    913.78x = 584,761.73
  5. Step 5: Solve for x
    x = 584,761.73/913.78
  6. Step 6: Final answer
    x = 639.94

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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.