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Finding the Fourth Proportional to 444.20, 665.49 and 386.60

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Solution

The fourth proportional to 444.20, 665.49 and 386.60 is: 579.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    444.20 : 665.49 = 386.60 : x
  2. Step 2: Convert to fraction form
    444.20/665.49 = 386.60/x
  3. Step 3: Cross multiply
    444.20x = 665.49 × 386.60
  4. Step 4: Simplify right side
    444.20x = 257,278.43
  5. Step 5: Solve for x
    x = 257,278.43/444.20
  6. Step 6: Final answer
    x = 579.20

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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.