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Finding the Fourth Proportional to 236.70, 355.10 and 74.39

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Solution

The fourth proportional to 236.70, 355.10 and 74.39 is: 111.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    236.70 : 355.10 = 74.39 : x
  2. Step 2: Convert to fraction form
    236.70/355.10 = 74.39/x
  3. Step 3: Cross multiply
    236.70x = 355.10 × 74.39
  4. Step 4: Simplify right side
    236.70x = 26,416.40
  5. Step 5: Solve for x
    x = 26,416.40/236.70
  6. Step 6: Final answer
    x = 111.60

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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.