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Finding the Fourth Proportional to 214.60, 321.90 and 129

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Solution

The fourth proportional to 214.60, 321.90 and 129 is: 193.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    214.60 : 321.90 = 129 : x
  2. Step 2: Convert to fraction form
    214.60/321.90 = 129/x
  3. Step 3: Cross multiply
    214.60x = 321.90 × 129
  4. Step 4: Simplify right side
    214.60x = 41,525.10
  5. Step 5: Solve for x
    x = 41,525.10/214.60
  6. Step 6: Final answer
    x = 193.50

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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.