Home / 1,292.36-1,938.48-426.56

Finding the Fourth Proportional to 1,292.36, 1,938.48 and 426.56

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Solution

The fourth proportional to 1,292.36, 1,938.48 and 426.56 is: 639.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,292.36 : 1,938.48 = 426.56 : x
  2. Step 2: Convert to fraction form
    1,292.36/1,938.48 = 426.56/x
  3. Step 3: Cross multiply
    1,292.36x = 1,938.48 × 426.56
  4. Step 4: Simplify right side
    1,292.36x = 826,878.03
  5. Step 5: Solve for x
    x = 826,878.03/1,292.36
  6. Step 6: Final answer
    x = 639.82

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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.