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Finding the Fourth Proportional to 141.64, 212.49 and 128.20

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Solution

The fourth proportional to 141.64, 212.49 and 128.20 is: 192.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    141.64 : 212.49 = 128.20 : x
  2. Step 2: Convert to fraction form
    141.64/212.49 = 128.20/x
  3. Step 3: Cross multiply
    141.64x = 212.49 × 128.20
  4. Step 4: Simplify right side
    141.64x = 27,241.22
  5. Step 5: Solve for x
    x = 27,241.22/141.64
  6. Step 6: Final answer
    x = 192.33

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.