Home / 1,292.20-1,938.58-426.52

Finding the Fourth Proportional to 1,292.20, 1,938.58 and 426.52

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Solution

The fourth proportional to 1,292.20, 1,938.58 and 426.52 is: 639.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,292.20 : 1,938.58 = 426.52 : x
  2. Step 2: Convert to fraction form
    1,292.20/1,938.58 = 426.52/x
  3. Step 3: Cross multiply
    1,292.20x = 1,938.58 × 426.52
  4. Step 4: Simplify right side
    1,292.20x = 826,843.14
  5. Step 5: Solve for x
    x = 826,843.14/1,292.20
  6. Step 6: Final answer
    x = 639.87

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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.