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Finding the Fourth Proportional to 214.84, 321.78 and 118.36

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Solution

The fourth proportional to 214.84, 321.78 and 118.36 is: 177.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    214.84 : 321.78 = 118.36 : x
  2. Step 2: Convert to fraction form
    214.84/321.78 = 118.36/x
  3. Step 3: Cross multiply
    214.84x = 321.78 × 118.36
  4. Step 4: Simplify right side
    214.84x = 38,085.88
  5. Step 5: Solve for x
    x = 38,085.88/214.84
  6. Step 6: Final answer
    x = 177.28

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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.