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Finding the Fourth Proportional to 1,387.99, 2,081.75 and 413.86

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Solution

The fourth proportional to 1,387.99, 2,081.75 and 413.86 is: 620.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,387.99 : 2,081.75 = 413.86 : x
  2. Step 2: Convert to fraction form
    1,387.99/2,081.75 = 413.86/x
  3. Step 3: Cross multiply
    1,387.99x = 2,081.75 × 413.86
  4. Step 4: Simplify right side
    1,387.99x = 861,552.01
  5. Step 5: Solve for x
    x = 861,552.01/1,387.99
  6. Step 6: Final answer
    x = 620.72

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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.