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Finding the Fourth Proportional to 290.79, 401.31 and 159.81

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Solution

The fourth proportional to 290.79, 401.31 and 159.81 is: 220.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    290.79 : 401.31 = 159.81 : x
  2. Step 2: Convert to fraction form
    290.79/401.31 = 159.81/x
  3. Step 3: Cross multiply
    290.79x = 401.31 × 159.81
  4. Step 4: Simplify right side
    290.79x = 64,133.35
  5. Step 5: Solve for x
    x = 64,133.35/290.79
  6. Step 6: Final answer
    x = 220.55

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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.