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Finding the Fourth Proportional to 290.85, 401.38 and 159.86

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Solution

The fourth proportional to 290.85, 401.38 and 159.86 is: 220.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    290.85 : 401.38 = 159.86 : x
  2. Step 2: Convert to fraction form
    290.85/401.38 = 159.86/x
  3. Step 3: Cross multiply
    290.85x = 401.38 × 159.86
  4. Step 4: Simplify right side
    290.85x = 64,164.61
  5. Step 5: Solve for x
    x = 64,164.61/290.85
  6. Step 6: Final answer
    x = 220.61

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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.