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Finding the Fourth Proportional to 214.53, 321.90 and 128.04

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Solution

The fourth proportional to 214.53, 321.90 and 128.04 is: 192.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    214.53 : 321.90 = 128.04 : x
  2. Step 2: Convert to fraction form
    214.53/321.90 = 128.04/x
  3. Step 3: Cross multiply
    214.53x = 321.90 × 128.04
  4. Step 4: Simplify right side
    214.53x = 41,216.08
  5. Step 5: Solve for x
    x = 41,216.08/214.53
  6. Step 6: Final answer
    x = 192.12

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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.