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Finding the Fourth Proportional to 216.30, 324.78 and 143.22

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Solution

The fourth proportional to 216.30, 324.78 and 143.22 is: 215.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    216.30 : 324.78 = 143.22 : x
  2. Step 2: Convert to fraction form
    216.30/324.78 = 143.22/x
  3. Step 3: Cross multiply
    216.30x = 324.78 × 143.22
  4. Step 4: Simplify right side
    216.30x = 46,514.99
  5. Step 5: Solve for x
    x = 46,514.99/216.30
  6. Step 6: Final answer
    x = 215.05

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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.