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Finding the Fourth Proportional to 1,291.92, 1,938.12 and 426.84

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Solution

The fourth proportional to 1,291.92, 1,938.12 and 426.84 is: 640.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,291.92 : 1,938.12 = 426.84 : x
  2. Step 2: Convert to fraction form
    1,291.92/1,938.12 = 426.84/x
  3. Step 3: Cross multiply
    1,291.92x = 1,938.12 × 426.84
  4. Step 4: Simplify right side
    1,291.92x = 827,267.14
  5. Step 5: Solve for x
    x = 827,267.14/1,291.92
  6. Step 6: Final answer
    x = 640.34

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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.