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Finding the Fourth Proportional to 290.77, 401.26 and 159.78

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Solution

The fourth proportional to 290.77, 401.26 and 159.78 is: 220.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    290.77 : 401.26 = 159.78 : x
  2. Step 2: Convert to fraction form
    290.77/401.26 = 159.78/x
  3. Step 3: Cross multiply
    290.77x = 401.26 × 159.78
  4. Step 4: Simplify right side
    290.77x = 64,110.52
  5. Step 5: Solve for x
    x = 64,110.52/290.77
  6. Step 6: Final answer
    x = 220.49

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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.