Home / 1,391.10-2,086.82-417.07

Finding the Fourth Proportional to 1,391.10, 2,086.82 and 417.07

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Solution

The fourth proportional to 1,391.10, 2,086.82 and 417.07 is: 625.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391.10 : 2,086.82 = 417.07 : x
  2. Step 2: Convert to fraction form
    1,391.10/2,086.82 = 417.07/x
  3. Step 3: Cross multiply
    1,391.10x = 2,086.82 × 417.07
  4. Step 4: Simplify right side
    1,391.10x = 870,350.02
  5. Step 5: Solve for x
    x = 870,350.02/1,391.10
  6. Step 6: Final answer
    x = 625.66

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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.