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Finding the Fourth Proportional to 236.65, 355.09 and 99.74

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Solution

The fourth proportional to 236.65, 355.09 and 99.74 is: 149.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    236.65 : 355.09 = 99.74 : x
  2. Step 2: Convert to fraction form
    236.65/355.09 = 99.74/x
  3. Step 3: Cross multiply
    236.65x = 355.09 × 99.74
  4. Step 4: Simplify right side
    236.65x = 35,416.68
  5. Step 5: Solve for x
    x = 35,416.68/236.65
  6. Step 6: Final answer
    x = 149.66

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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.