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Finding the Fourth Proportional to 211.60, 290.81 and 190

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Solution

The fourth proportional to 211.60, 290.81 and 190 is: 261.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.60 : 290.81 = 190 : x
  2. Step 2: Convert to fraction form
    211.60/290.81 = 190/x
  3. Step 3: Cross multiply
    211.60x = 290.81 × 190
  4. Step 4: Simplify right side
    211.60x = 55,253.90
  5. Step 5: Solve for x
    x = 55,253.90/211.60
  6. Step 6: Final answer
    x = 261.12

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.