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Finding the Fourth Proportional to 913.72, 1,370.67 and 426.91

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Solution

The fourth proportional to 913.72, 1,370.67 and 426.91 is: 640.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    913.72 : 1,370.67 = 426.91 : x
  2. Step 2: Convert to fraction form
    913.72/1,370.67 = 426.91/x
  3. Step 3: Cross multiply
    913.72x = 1,370.67 × 426.91
  4. Step 4: Simplify right side
    913.72x = 585,152.73
  5. Step 5: Solve for x
    x = 585,152.73/913.72
  6. Step 6: Final answer
    x = 640.41

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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.