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Finding the Fourth Proportional to 214.40, 295.86 and 121.15

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Solution

The fourth proportional to 214.40, 295.86 and 121.15 is: 167.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    214.40 : 295.86 = 121.15 : x
  2. Step 2: Convert to fraction form
    214.40/295.86 = 121.15/x
  3. Step 3: Cross multiply
    214.40x = 295.86 × 121.15
  4. Step 4: Simplify right side
    214.40x = 35,843.44
  5. Step 5: Solve for x
    x = 35,843.44/214.40
  6. Step 6: Final answer
    x = 167.18

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.