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Finding the Fourth Proportional to 660.67, 989.61 and 413.04

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Solution

The fourth proportional to 660.67, 989.61 and 413.04 is: 618.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.67 : 989.61 = 413.04 : x
  2. Step 2: Convert to fraction form
    660.67/989.61 = 413.04/x
  3. Step 3: Cross multiply
    660.67x = 989.61 × 413.04
  4. Step 4: Simplify right side
    660.67x = 408,748.51
  5. Step 5: Solve for x
    x = 408,748.51/660.67
  6. Step 6: Final answer
    x = 618.69

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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.