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Finding the Fourth Proportional to 141.90, 212.65 and 105.81

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Solution

The fourth proportional to 141.90, 212.65 and 105.81 is: 158.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    141.90 : 212.65 = 105.81 : x
  2. Step 2: Convert to fraction form
    141.90/212.65 = 105.81/x
  3. Step 3: Cross multiply
    141.90x = 212.65 × 105.81
  4. Step 4: Simplify right side
    141.90x = 22,500.23
  5. Step 5: Solve for x
    x = 22,500.23/141.90
  6. Step 6: Final answer
    x = 158.56

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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.