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Finding the Fourth Proportional to 236.87, 355.36 and 139.45

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Solution

The fourth proportional to 236.87, 355.36 and 139.45 is: 209.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    236.87 : 355.36 = 139.45 : x
  2. Step 2: Convert to fraction form
    236.87/355.36 = 139.45/x
  3. Step 3: Cross multiply
    236.87x = 355.36 × 139.45
  4. Step 4: Simplify right side
    236.87x = 49,555.03
  5. Step 5: Solve for x
    x = 49,555.03/236.87
  6. Step 6: Final answer
    x = 209.21

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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.