Home / 1,431.59-2,147.43-391.61

Finding the Fourth Proportional to 1,431.59, 2,147.43 and 391.61

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Solution

The fourth proportional to 1,431.59, 2,147.43 and 391.61 is: 587.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,431.59 : 2,147.43 = 391.61 : x
  2. Step 2: Convert to fraction form
    1,431.59/2,147.43 = 391.61/x
  3. Step 3: Cross multiply
    1,431.59x = 2,147.43 × 391.61
  4. Step 4: Simplify right side
    1,431.59x = 840,944.33
  5. Step 5: Solve for x
    x = 840,944.33/1,431.59
  6. Step 6: Final answer
    x = 587.42

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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.