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Finding the Fourth Proportional to 141.20, 211.86 and 69.05

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Solution

The fourth proportional to 141.20, 211.86 and 69.05 is: 103.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    141.20 : 211.86 = 69.05 : x
  2. Step 2: Convert to fraction form
    141.20/211.86 = 69.05/x
  3. Step 3: Cross multiply
    141.20x = 211.86 × 69.05
  4. Step 4: Simplify right side
    141.20x = 14,627.87
  5. Step 5: Solve for x
    x = 14,627.87/141.20
  6. Step 6: Final answer
    x = 103.60

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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.