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Finding the Fourth Proportional to 214.16, 321.20 and 111.40

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Solution

The fourth proportional to 214.16, 321.20 and 111.40 is: 167.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    214.16 : 321.20 = 111.40 : x
  2. Step 2: Convert to fraction form
    214.16/321.20 = 111.40/x
  3. Step 3: Cross multiply
    214.16x = 321.20 × 111.40
  4. Step 4: Simplify right side
    214.16x = 35,781.68
  5. Step 5: Solve for x
    x = 35,781.68/214.16
  6. Step 6: Final answer
    x = 167.08

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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.