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Finding the Fourth Proportional to 236.75, 355.09 and 90.47

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Solution

The fourth proportional to 236.75, 355.09 and 90.47 is: 135.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    236.75 : 355.09 = 90.47 : x
  2. Step 2: Convert to fraction form
    236.75/355.09 = 90.47/x
  3. Step 3: Cross multiply
    236.75x = 355.09 × 90.47
  4. Step 4: Simplify right side
    236.75x = 32,122.99
  5. Step 5: Solve for x
    x = 32,122.99/236.75
  6. Step 6: Final answer
    x = 135.69

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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.