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Finding the Fourth Proportional to 236.46, 355.72 and 145.20

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Solution

The fourth proportional to 236.46, 355.72 and 145.20 is: 218.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    236.46 : 355.72 = 145.20 : x
  2. Step 2: Convert to fraction form
    236.46/355.72 = 145.20/x
  3. Step 3: Cross multiply
    236.46x = 355.72 × 145.20
  4. Step 4: Simplify right side
    236.46x = 51,650.54
  5. Step 5: Solve for x
    x = 51,650.54/236.46
  6. Step 6: Final answer
    x = 218.43

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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.