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Finding the Fourth Proportional to 290.19, 400.66 and 202.71

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Solution

The fourth proportional to 290.19, 400.66 and 202.71 is: 279.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    290.19 : 400.66 = 202.71 : x
  2. Step 2: Convert to fraction form
    290.19/400.66 = 202.71/x
  3. Step 3: Cross multiply
    290.19x = 400.66 × 202.71
  4. Step 4: Simplify right side
    290.19x = 81,217.79
  5. Step 5: Solve for x
    x = 81,217.79/290.19
  6. Step 6: Final answer
    x = 279.88

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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.