Home / 1,391.15-2,086.59-417.26

Finding the Fourth Proportional to 1,391.15, 2,086.59 and 417.26

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Solution

The fourth proportional to 1,391.15, 2,086.59 and 417.26 is: 625.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391.15 : 2,086.59 = 417.26 : x
  2. Step 2: Convert to fraction form
    1,391.15/2,086.59 = 417.26/x
  3. Step 3: Cross multiply
    1,391.15x = 2,086.59 × 417.26
  4. Step 4: Simplify right side
    1,391.15x = 870,650.54
  5. Step 5: Solve for x
    x = 870,650.54/1,391.15
  6. Step 6: Final answer
    x = 625.85

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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.