Home / 1,391.11-2,086.66-417.21

Finding the Fourth Proportional to 1,391.11, 2,086.66 and 417.21

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Solution

The fourth proportional to 1,391.11, 2,086.66 and 417.21 is: 625.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391.11 : 2,086.66 = 417.21 : x
  2. Step 2: Convert to fraction form
    1,391.11/2,086.66 = 417.21/x
  3. Step 3: Cross multiply
    1,391.11x = 2,086.66 × 417.21
  4. Step 4: Simplify right side
    1,391.11x = 870,564.99
  5. Step 5: Solve for x
    x = 870,564.99/1,391.11
  6. Step 6: Final answer
    x = 625.81

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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.