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Finding the Fourth Proportional to 193.79, 267.40 and 120.05

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Solution

The fourth proportional to 193.79, 267.40 and 120.05 is: 165.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    193.79 : 267.40 = 120.05 : x
  2. Step 2: Convert to fraction form
    193.79/267.40 = 120.05/x
  3. Step 3: Cross multiply
    193.79x = 267.40 × 120.05
  4. Step 4: Simplify right side
    193.79x = 32,101.19
  5. Step 5: Solve for x
    x = 32,101.19/193.79
  6. Step 6: Final answer
    x = 165.65

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.