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Finding the Fourth Proportional to 236.70, 354.72 and 139.29

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Solution

The fourth proportional to 236.70, 354.72 and 139.29 is: 208.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    236.70 : 354.72 = 139.29 : x
  2. Step 2: Convert to fraction form
    236.70/354.72 = 139.29/x
  3. Step 3: Cross multiply
    236.70x = 354.72 × 139.29
  4. Step 4: Simplify right side
    236.70x = 49,408.95
  5. Step 5: Solve for x
    x = 49,408.95/236.70
  6. Step 6: Final answer
    x = 208.74

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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.