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Finding the Fourth Proportional to 290.35, 400.51 and 201.91

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Solution

The fourth proportional to 290.35, 400.51 and 201.91 is: 278.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    290.35 : 400.51 = 201.91 : x
  2. Step 2: Convert to fraction form
    290.35/400.51 = 201.91/x
  3. Step 3: Cross multiply
    290.35x = 400.51 × 201.91
  4. Step 4: Simplify right side
    290.35x = 80,866.98
  5. Step 5: Solve for x
    x = 80,866.98/290.35
  6. Step 6: Final answer
    x = 278.51

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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.