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Finding the Fourth Proportional to 242.64, 363.96 and 139.62

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Solution

The fourth proportional to 242.64, 363.96 and 139.62 is: 209.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    242.64 : 363.96 = 139.62 : x
  2. Step 2: Convert to fraction form
    242.64/363.96 = 139.62/x
  3. Step 3: Cross multiply
    242.64x = 363.96 × 139.62
  4. Step 4: Simplify right side
    242.64x = 50,816.10
  5. Step 5: Solve for x
    x = 50,816.10/242.64
  6. Step 6: Final answer
    x = 209.43

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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.