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Finding the Fourth Proportional to 214.92, 321.90 and 118.50

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Solution

The fourth proportional to 214.92, 321.90 and 118.50 is: 177.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    214.92 : 321.90 = 118.50 : x
  2. Step 2: Convert to fraction form
    214.92/321.90 = 118.50/x
  3. Step 3: Cross multiply
    214.92x = 321.90 × 118.50
  4. Step 4: Simplify right side
    214.92x = 38,145.15
  5. Step 5: Solve for x
    x = 38,145.15/214.92
  6. Step 6: Final answer
    x = 177.49

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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.