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Finding the Fourth Proportional to 236.61, 354.78 and 74.25

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Solution

The fourth proportional to 236.61, 354.78 and 74.25 is: 111.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    236.61 : 354.78 = 74.25 : x
  2. Step 2: Convert to fraction form
    236.61/354.78 = 74.25/x
  3. Step 3: Cross multiply
    236.61x = 354.78 × 74.25
  4. Step 4: Simplify right side
    236.61x = 26,342.42
  5. Step 5: Solve for x
    x = 26,342.42/236.61
  6. Step 6: Final answer
    x = 111.33

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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.