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Finding the Fourth Proportional to 175.20, 242.08 and 138.66

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Solution

The fourth proportional to 175.20, 242.08 and 138.66 is: 191.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    175.20 : 242.08 = 138.66 : x
  2. Step 2: Convert to fraction form
    175.20/242.08 = 138.66/x
  3. Step 3: Cross multiply
    175.20x = 242.08 × 138.66
  4. Step 4: Simplify right side
    175.20x = 33,566.81
  5. Step 5: Solve for x
    x = 33,566.81/175.20
  6. Step 6: Final answer
    x = 191.59

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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.