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Finding the Fourth Proportional to 290.15, 400.43 and 197.07

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Solution

The fourth proportional to 290.15, 400.43 and 197.07 is: 271.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    290.15 : 400.43 = 197.07 : x
  2. Step 2: Convert to fraction form
    290.15/400.43 = 197.07/x
  3. Step 3: Cross multiply
    290.15x = 400.43 × 197.07
  4. Step 4: Simplify right side
    290.15x = 78,911.75
  5. Step 5: Solve for x
    x = 78,911.75/290.15
  6. Step 6: Final answer
    x = 271.97

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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.