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Finding the Fourth Proportional to 141.92, 212.64 and 90.44

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Solution

The fourth proportional to 141.92, 212.64 and 90.44 is: 135.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    141.92 : 212.64 = 90.44 : x
  2. Step 2: Convert to fraction form
    141.92/212.64 = 90.44/x
  3. Step 3: Cross multiply
    141.92x = 212.64 × 90.44
  4. Step 4: Simplify right side
    141.92x = 19,231.16
  5. Step 5: Solve for x
    x = 19,231.16/141.92
  6. Step 6: Final answer
    x = 135.51

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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.