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Finding the Fourth Proportional to 440.88, 608.08 and 393.66

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Solution

The fourth proportional to 440.88, 608.08 and 393.66 is: 542.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    440.88 : 608.08 = 393.66 : x
  2. Step 2: Convert to fraction form
    440.88/608.08 = 393.66/x
  3. Step 3: Cross multiply
    440.88x = 608.08 × 393.66
  4. Step 4: Simplify right side
    440.88x = 239,374.80
  5. Step 5: Solve for x
    x = 239,374.80/440.88
  6. Step 6: Final answer
    x = 542.95

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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.