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Finding the Fourth Proportional to 141.37, 212.18 and 79.74

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Solution

The fourth proportional to 141.37, 212.18 and 79.74 is: 119.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    141.37 : 212.18 = 79.74 : x
  2. Step 2: Convert to fraction form
    141.37/212.18 = 79.74/x
  3. Step 3: Cross multiply
    141.37x = 212.18 × 79.74
  4. Step 4: Simplify right side
    141.37x = 16,918.83
  5. Step 5: Solve for x
    x = 16,918.83/141.37
  6. Step 6: Final answer
    x = 119.68

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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.