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Finding the Fourth Proportional to 236.77, 355.30 and 99.81

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Solution

The fourth proportional to 236.77, 355.30 and 99.81 is: 149.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    236.77 : 355.30 = 99.81 : x
  2. Step 2: Convert to fraction form
    236.77/355.30 = 99.81/x
  3. Step 3: Cross multiply
    236.77x = 355.30 × 99.81
  4. Step 4: Simplify right side
    236.77x = 35,462.49
  5. Step 5: Solve for x
    x = 35,462.49/236.77
  6. Step 6: Final answer
    x = 149.78

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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.