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Finding the Fourth Proportional to 236.66, 355.08 and 99.80

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Solution

The fourth proportional to 236.66, 355.08 and 99.80 is: 149.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    236.66 : 355.08 = 99.80 : x
  2. Step 2: Convert to fraction form
    236.66/355.08 = 99.80/x
  3. Step 3: Cross multiply
    236.66x = 355.08 × 99.80
  4. Step 4: Simplify right side
    236.66x = 35,436.91
  5. Step 5: Solve for x
    x = 35,436.91/236.66
  6. Step 6: Final answer
    x = 149.74

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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.