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Finding the Fourth Proportional to 141.80, 195.12 and 128

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Solution

The fourth proportional to 141.80, 195.12 and 128 is: 176.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    141.80 : 195.12 = 128 : x
  2. Step 2: Convert to fraction form
    141.80/195.12 = 128/x
  3. Step 3: Cross multiply
    141.80x = 195.12 × 128
  4. Step 4: Simplify right side
    141.80x = 24,975.36
  5. Step 5: Solve for x
    x = 24,975.36/141.80
  6. Step 6: Final answer
    x = 176.13

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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.