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Finding the Fourth Proportional to 290.43, 400.80 and 159.45

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Solution

The fourth proportional to 290.43, 400.80 and 159.45 is: 220.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    290.43 : 400.80 = 159.45 : x
  2. Step 2: Convert to fraction form
    290.43/400.80 = 159.45/x
  3. Step 3: Cross multiply
    290.43x = 400.80 × 159.45
  4. Step 4: Simplify right side
    290.43x = 63,905.56
  5. Step 5: Solve for x
    x = 63,905.56/290.43
  6. Step 6: Final answer
    x = 220.04

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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.