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Finding the Fourth Proportional to 413.56, 619.53 and 386.83

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Solution

The fourth proportional to 413.56, 619.53 and 386.83 is: 579.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    413.56 : 619.53 = 386.83 : x
  2. Step 2: Convert to fraction form
    413.56/619.53 = 386.83/x
  3. Step 3: Cross multiply
    413.56x = 619.53 × 386.83
  4. Step 4: Simplify right side
    413.56x = 239,652.79
  5. Step 5: Solve for x
    x = 239,652.79/413.56
  6. Step 6: Final answer
    x = 579.49

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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.