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Finding the Fourth Proportional to 242.20, 334.08 and 138.70

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Solution

The fourth proportional to 242.20, 334.08 and 138.70 is: 191.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    242.20 : 334.08 = 138.70 : x
  2. Step 2: Convert to fraction form
    242.20/334.08 = 138.70/x
  3. Step 3: Cross multiply
    242.20x = 334.08 × 138.70
  4. Step 4: Simplify right side
    242.20x = 46,336.90
  5. Step 5: Solve for x
    x = 46,336.90/242.20
  6. Step 6: Final answer
    x = 191.32

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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.