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Finding the Fourth Proportional to 720.88, 1,081.71 and 413.35

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Solution

The fourth proportional to 720.88, 1,081.71 and 413.35 is: 620.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.88 : 1,081.71 = 413.35 : x
  2. Step 2: Convert to fraction form
    720.88/1,081.71 = 413.35/x
  3. Step 3: Cross multiply
    720.88x = 1,081.71 × 413.35
  4. Step 4: Simplify right side
    720.88x = 447,122.12
  5. Step 5: Solve for x
    x = 447,122.12/720.88
  6. Step 6: Final answer
    x = 620.25

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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.