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Finding the Fourth Proportional to 439.26, 606.18 and 291.90

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Solution

The fourth proportional to 439.26, 606.18 and 291.90 is: 402.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.26 : 606.18 = 291.90 : x
  2. Step 2: Convert to fraction form
    439.26/606.18 = 291.90/x
  3. Step 3: Cross multiply
    439.26x = 606.18 × 291.90
  4. Step 4: Simplify right side
    439.26x = 176,943.94
  5. Step 5: Solve for x
    x = 176,943.94/439.26
  6. Step 6: Final answer
    x = 402.82

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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.