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Finding the Fourth Proportional to 439.21, 606.62 and 291.59

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Solution

The fourth proportional to 439.21, 606.62 and 291.59 is: 402.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.21 : 606.62 = 291.59 : x
  2. Step 2: Convert to fraction form
    439.21/606.62 = 291.59/x
  3. Step 3: Cross multiply
    439.21x = 606.62 × 291.59
  4. Step 4: Simplify right side
    439.21x = 176,884.33
  5. Step 5: Solve for x
    x = 176,884.33/439.21
  6. Step 6: Final answer
    x = 402.73

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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.