Home / 1,292.28-1,938.60-426.50

Finding the Fourth Proportional to 1,292.28, 1,938.60 and 426.50

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Solution

The fourth proportional to 1,292.28, 1,938.60 and 426.50 is: 639.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,292.28 : 1,938.60 = 426.50 : x
  2. Step 2: Convert to fraction form
    1,292.28/1,938.60 = 426.50/x
  3. Step 3: Cross multiply
    1,292.28x = 1,938.60 × 426.50
  4. Step 4: Simplify right side
    1,292.28x = 826,812.90
  5. Step 5: Solve for x
    x = 826,812.90/1,292.28
  6. Step 6: Final answer
    x = 639.81

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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.