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Finding the Fourth Proportional to 236.63, 355.09 and 139.32

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Solution

The fourth proportional to 236.63, 355.09 and 139.32 is: 209.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    236.63 : 355.09 = 139.32 : x
  2. Step 2: Convert to fraction form
    236.63/355.09 = 139.32/x
  3. Step 3: Cross multiply
    236.63x = 355.09 × 139.32
  4. Step 4: Simplify right side
    236.63x = 49,471.05
  5. Step 5: Solve for x
    x = 49,471.05/236.63
  6. Step 6: Final answer
    x = 209.07

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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.