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Finding the Fourth Proportional to 290.98, 401.55 and 159.99

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Solution

The fourth proportional to 290.98, 401.55 and 159.99 is: 220.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    290.98 : 401.55 = 159.99 : x
  2. Step 2: Convert to fraction form
    290.98/401.55 = 159.99/x
  3. Step 3: Cross multiply
    290.98x = 401.55 × 159.99
  4. Step 4: Simplify right side
    290.98x = 64,241.18
  5. Step 5: Solve for x
    x = 64,241.18/290.98
  6. Step 6: Final answer
    x = 220.78

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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.