Home / 1,413.10-2,119.64-439.20

Finding the Fourth Proportional to 1,413.10, 2,119.64 and 439.20

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Solution

The fourth proportional to 1,413.10, 2,119.64 and 439.20 is: 658.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,413.10 : 2,119.64 = 439.20 : x
  2. Step 2: Convert to fraction form
    1,413.10/2,119.64 = 439.20/x
  3. Step 3: Cross multiply
    1,413.10x = 2,119.64 × 439.20
  4. Step 4: Simplify right side
    1,413.10x = 930,945.89
  5. Step 5: Solve for x
    x = 930,945.89/1,413.10
  6. Step 6: Final answer
    x = 658.80

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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.