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Finding the Fourth Proportional to 439.12, 605.82 and 291.70

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Solution

The fourth proportional to 439.12, 605.82 and 291.70 is: 402.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.12 : 605.82 = 291.70 : x
  2. Step 2: Convert to fraction form
    439.12/605.82 = 291.70/x
  3. Step 3: Cross multiply
    439.12x = 605.82 × 291.70
  4. Step 4: Simplify right side
    439.12x = 176,717.69
  5. Step 5: Solve for x
    x = 176,717.69/439.12
  6. Step 6: Final answer
    x = 402.44

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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.