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Finding the Fourth Proportional to 439.41, 605.93 and 315.42

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Solution

The fourth proportional to 439.41, 605.93 and 315.42 is: 434.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.41 : 605.93 = 315.42 : x
  2. Step 2: Convert to fraction form
    439.41/605.93 = 315.42/x
  3. Step 3: Cross multiply
    439.41x = 605.93 × 315.42
  4. Step 4: Simplify right side
    439.41x = 191,120.86
  5. Step 5: Solve for x
    x = 191,120.86/439.41
  6. Step 6: Final answer
    x = 434.95

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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.