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Finding the Fourth Proportional to 439.09, 606.45 and 291.46

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Solution

The fourth proportional to 439.09, 606.45 and 291.46 is: 402.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.09 : 606.45 = 291.46 : x
  2. Step 2: Convert to fraction form
    439.09/606.45 = 291.46/x
  3. Step 3: Cross multiply
    439.09x = 606.45 × 291.46
  4. Step 4: Simplify right side
    439.09x = 176,755.92
  5. Step 5: Solve for x
    x = 176,755.92/439.09
  6. Step 6: Final answer
    x = 402.55

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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.