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Finding the Fourth Proportional to 216.36, 324.59 and 86.36

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Solution

The fourth proportional to 216.36, 324.59 and 86.36 is: 129.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    216.36 : 324.59 = 86.36 : x
  2. Step 2: Convert to fraction form
    216.36/324.59 = 86.36/x
  3. Step 3: Cross multiply
    216.36x = 324.59 × 86.36
  4. Step 4: Simplify right side
    216.36x = 28,029.54
  5. Step 5: Solve for x
    x = 28,029.54/216.36
  6. Step 6: Final answer
    x = 129.55

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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.