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Finding the Fourth Proportional to 141.70, 212.28 and 128.74

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Solution

The fourth proportional to 141.70, 212.28 and 128.74 is: 192.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    141.70 : 212.28 = 128.74 : x
  2. Step 2: Convert to fraction form
    141.70/212.28 = 128.74/x
  3. Step 3: Cross multiply
    141.70x = 212.28 × 128.74
  4. Step 4: Simplify right side
    141.70x = 27,328.93
  5. Step 5: Solve for x
    x = 27,328.93/141.70
  6. Step 6: Final answer
    x = 192.86

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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.