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Finding the Fourth Proportional to 913.92, 1,370.58 and 426.66

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Solution

The fourth proportional to 913.92, 1,370.58 and 426.66 is: 639.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    913.92 : 1,370.58 = 426.66 : x
  2. Step 2: Convert to fraction form
    913.92/1,370.58 = 426.66/x
  3. Step 3: Cross multiply
    913.92x = 1,370.58 × 426.66
  4. Step 4: Simplify right side
    913.92x = 584,771.66
  5. Step 5: Solve for x
    x = 584,771.66/913.92
  6. Step 6: Final answer
    x = 639.85

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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.