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Finding the Fourth Proportional to 440.68, 608.09 and 393.90

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Solution

The fourth proportional to 440.68, 608.09 and 393.90 is: 543.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    440.68 : 608.09 = 393.90 : x
  2. Step 2: Convert to fraction form
    440.68/608.09 = 393.90/x
  3. Step 3: Cross multiply
    440.68x = 608.09 × 393.90
  4. Step 4: Simplify right side
    440.68x = 239,523.61
  5. Step 5: Solve for x
    x = 239,523.61/440.68
  6. Step 6: Final answer
    x = 543.54

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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.