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Finding the Fourth Proportional to 656.96, 986.84 and 413.66

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Solution

The fourth proportional to 656.96, 986.84 and 413.66 is: 621.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    656.96 : 986.84 = 413.66 : x
  2. Step 2: Convert to fraction form
    656.96/986.84 = 413.66/x
  3. Step 3: Cross multiply
    656.96x = 986.84 × 413.66
  4. Step 4: Simplify right side
    656.96x = 408,216.23
  5. Step 5: Solve for x
    x = 408,216.23/656.96
  6. Step 6: Final answer
    x = 621.37

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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.