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Finding the Fourth Proportional to 413.55, 619.45 and 385.07

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Solution

The fourth proportional to 413.55, 619.45 and 385.07 is: 576.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    413.55 : 619.45 = 385.07 : x
  2. Step 2: Convert to fraction form
    413.55/619.45 = 385.07/x
  3. Step 3: Cross multiply
    413.55x = 619.45 × 385.07
  4. Step 4: Simplify right side
    413.55x = 238,527.55
  5. Step 5: Solve for x
    x = 238,527.55/413.55
  6. Step 6: Final answer
    x = 576.78

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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.