Home / 1,399.10-2,098.77-425.21

Finding the Fourth Proportional to 1,399.10, 2,098.77 and 425.21

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Solution

The fourth proportional to 1,399.10, 2,098.77 and 425.21 is: 637.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,399.10 : 2,098.77 = 425.21 : x
  2. Step 2: Convert to fraction form
    1,399.10/2,098.77 = 425.21/x
  3. Step 3: Cross multiply
    1,399.10x = 2,098.77 × 425.21
  4. Step 4: Simplify right side
    1,399.10x = 892,413.77
  5. Step 5: Solve for x
    x = 892,413.77/1,399.10
  6. Step 6: Final answer
    x = 637.85

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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.