Home / 1,391.10-2,086.30-403.71

Finding the Fourth Proportional to 1,391.10, 2,086.30 and 403.71

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Solution

The fourth proportional to 1,391.10, 2,086.30 and 403.71 is: 605.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391.10 : 2,086.30 = 403.71 : x
  2. Step 2: Convert to fraction form
    1,391.10/2,086.30 = 403.71/x
  3. Step 3: Cross multiply
    1,391.10x = 2,086.30 × 403.71
  4. Step 4: Simplify right side
    1,391.10x = 842,260.17
  5. Step 5: Solve for x
    x = 842,260.17/1,391.10
  6. Step 6: Final answer
    x = 605.46

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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.