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Finding the Fourth Proportional to 210.20, 290.20 and 140.36

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Solution

The fourth proportional to 210.20, 290.20 and 140.36 is: 193.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    210.20 : 290.20 = 140.36 : x
  2. Step 2: Convert to fraction form
    210.20/290.20 = 140.36/x
  3. Step 3: Cross multiply
    210.20x = 290.20 × 140.36
  4. Step 4: Simplify right side
    210.20x = 40,732.47
  5. Step 5: Solve for x
    x = 40,732.47/210.20
  6. Step 6: Final answer
    x = 193.78

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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.