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Finding the Fourth Proportional to 214.48, 321.78 and 86.32

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Solution

The fourth proportional to 214.48, 321.78 and 86.32 is: 129.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    214.48 : 321.78 = 86.32 : x
  2. Step 2: Convert to fraction form
    214.48/321.78 = 86.32/x
  3. Step 3: Cross multiply
    214.48x = 321.78 × 86.32
  4. Step 4: Simplify right side
    214.48x = 27,776.05
  5. Step 5: Solve for x
    x = 27,776.05/214.48
  6. Step 6: Final answer
    x = 129.50

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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.