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Finding the Fourth Proportional to 439.28, 606.45 and 299.60

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Solution

The fourth proportional to 439.28, 606.45 and 299.60 is: 413.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.28 : 606.45 = 299.60 : x
  2. Step 2: Convert to fraction form
    439.28/606.45 = 299.60/x
  3. Step 3: Cross multiply
    439.28x = 606.45 × 299.60
  4. Step 4: Simplify right side
    439.28x = 181,694.71
  5. Step 5: Solve for x
    x = 181,694.71/439.28
  6. Step 6: Final answer
    x = 413.62

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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.