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Finding the Fourth Proportional to 214.40, 321.59 and 90.95

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Solution

The fourth proportional to 214.40, 321.59 and 90.95 is: 136.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    214.40 : 321.59 = 90.95 : x
  2. Step 2: Convert to fraction form
    214.40/321.59 = 90.95/x
  3. Step 3: Cross multiply
    214.40x = 321.59 × 90.95
  4. Step 4: Simplify right side
    214.40x = 29,248.61
  5. Step 5: Solve for x
    x = 29,248.61/214.40
  6. Step 6: Final answer
    x = 136.42

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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.