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Finding the Fourth Proportional to 141.68, 212.61 and 92.81

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Solution

The fourth proportional to 141.68, 212.61 and 92.81 is: 139.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    141.68 : 212.61 = 92.81 : x
  2. Step 2: Convert to fraction form
    141.68/212.61 = 92.81/x
  3. Step 3: Cross multiply
    141.68x = 212.61 × 92.81
  4. Step 4: Simplify right side
    141.68x = 19,732.94
  5. Step 5: Solve for x
    x = 19,732.94/141.68
  6. Step 6: Final answer
    x = 139.28

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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.