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Finding the Fourth Proportional to 645.68, 966.98 and 413.84

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Solution

The fourth proportional to 645.68, 966.98 and 413.84 is: 619.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    645.68 : 966.98 = 413.84 : x
  2. Step 2: Convert to fraction form
    645.68/966.98 = 413.84/x
  3. Step 3: Cross multiply
    645.68x = 966.98 × 413.84
  4. Step 4: Simplify right side
    645.68x = 400,175.00
  5. Step 5: Solve for x
    x = 400,175.00/645.68
  6. Step 6: Final answer
    x = 619.77

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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.