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Finding the Fourth Proportional to 413.18, 619.80 and 135.54

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Solution

The fourth proportional to 413.18, 619.80 and 135.54 is: 203.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    413.18 : 619.80 = 135.54 : x
  2. Step 2: Convert to fraction form
    413.18/619.80 = 135.54/x
  3. Step 3: Cross multiply
    413.18x = 619.80 × 135.54
  4. Step 4: Simplify right side
    413.18x = 84,007.69
  5. Step 5: Solve for x
    x = 84,007.69/413.18
  6. Step 6: Final answer
    x = 203.32

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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.