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Finding the Fourth Proportional to 242.82, 364.05 and 139.86

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Solution

The fourth proportional to 242.82, 364.05 and 139.86 is: 209.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    242.82 : 364.05 = 139.86 : x
  2. Step 2: Convert to fraction form
    242.82/364.05 = 139.86/x
  3. Step 3: Cross multiply
    242.82x = 364.05 × 139.86
  4. Step 4: Simplify right side
    242.82x = 50,916.03
  5. Step 5: Solve for x
    x = 50,916.03/242.82
  6. Step 6: Final answer
    x = 209.69

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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.