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Finding the Fourth Proportional to 413.88, 571.20 and 239.28

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Solution

The fourth proportional to 413.88, 571.20 and 239.28 is: 330.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    413.88 : 571.20 = 239.28 : x
  2. Step 2: Convert to fraction form
    413.88/571.20 = 239.28/x
  3. Step 3: Cross multiply
    413.88x = 571.20 × 239.28
  4. Step 4: Simplify right side
    413.88x = 136,676.74
  5. Step 5: Solve for x
    x = 136,676.74/413.88
  6. Step 6: Final answer
    x = 330.23

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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.