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Finding the Fourth Proportional to 214.79, 296.40 and 121.55

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Solution

The fourth proportional to 214.79, 296.40 and 121.55 is: 167.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    214.79 : 296.40 = 121.55 : x
  2. Step 2: Convert to fraction form
    214.79/296.40 = 121.55/x
  3. Step 3: Cross multiply
    214.79x = 296.40 × 121.55
  4. Step 4: Simplify right side
    214.79x = 36,025.33
  5. Step 5: Solve for x
    x = 36,025.33/214.79
  6. Step 6: Final answer
    x = 167.72

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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.