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Finding the Fourth Proportional to 1,413.80, 2,120.70 and 439.90

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Solution

The fourth proportional to 1,413.80, 2,120.70 and 439.90 is: 659.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,413.80 : 2,120.70 = 439.90 : x
  2. Step 2: Convert to fraction form
    1,413.80/2,120.70 = 439.90/x
  3. Step 3: Cross multiply
    1,413.80x = 2,120.70 × 439.90
  4. Step 4: Simplify right side
    1,413.80x = 932,895.93
  5. Step 5: Solve for x
    x = 932,895.93/1,413.80
  6. Step 6: Final answer
    x = 659.85

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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.