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Finding the Fourth Proportional to 214.36, 321.55 and 90.94

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Solution

The fourth proportional to 214.36, 321.55 and 90.94 is: 136.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    214.36 : 321.55 = 90.94 : x
  2. Step 2: Convert to fraction form
    214.36/321.55 = 90.94/x
  3. Step 3: Cross multiply
    214.36x = 321.55 × 90.94
  4. Step 4: Simplify right side
    214.36x = 29,241.76
  5. Step 5: Solve for x
    x = 29,241.76/214.36
  6. Step 6: Final answer
    x = 136.41

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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.