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Finding the Fourth Proportional to 141.70, 211.09 and 129.22

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Solution

The fourth proportional to 141.70, 211.09 and 129.22 is: 192.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    141.70 : 211.09 = 129.22 : x
  2. Step 2: Convert to fraction form
    141.70/211.09 = 129.22/x
  3. Step 3: Cross multiply
    141.70x = 211.09 × 129.22
  4. Step 4: Simplify right side
    141.70x = 27,276.40
  5. Step 5: Solve for x
    x = 27,276.40/141.70
  6. Step 6: Final answer
    x = 192.49

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.