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Finding the Fourth Proportional to 236.90, 354.80 and 121.16

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Solution

The fourth proportional to 236.90, 354.80 and 121.16 is: 181.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    236.90 : 354.80 = 121.16 : x
  2. Step 2: Convert to fraction form
    236.90/354.80 = 121.16/x
  3. Step 3: Cross multiply
    236.90x = 354.80 × 121.16
  4. Step 4: Simplify right side
    236.90x = 42,987.57
  5. Step 5: Solve for x
    x = 42,987.57/236.90
  6. Step 6: Final answer
    x = 181.46

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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.