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Finding the Fourth Proportional to 666.09, 919.16 and 413.91

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Solution

The fourth proportional to 666.09, 919.16 and 413.91 is: 571.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.09 : 919.16 = 413.91 : x
  2. Step 2: Convert to fraction form
    666.09/919.16 = 413.91/x
  3. Step 3: Cross multiply
    666.09x = 919.16 × 413.91
  4. Step 4: Simplify right side
    666.09x = 380,447.45
  5. Step 5: Solve for x
    x = 380,447.45/666.09
  6. Step 6: Final answer
    x = 571.17

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.