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Finding the Fourth Proportional to 236.88, 355.15 and 99.81

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Solution

The fourth proportional to 236.88, 355.15 and 99.81 is: 149.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    236.88 : 355.15 = 99.81 : x
  2. Step 2: Convert to fraction form
    236.88/355.15 = 99.81/x
  3. Step 3: Cross multiply
    236.88x = 355.15 × 99.81
  4. Step 4: Simplify right side
    236.88x = 35,445.25
  5. Step 5: Solve for x
    x = 35,445.25/236.88
  6. Step 6: Final answer
    x = 149.64

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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.