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Finding the Fourth Proportional to 216.40, 324.52 and 79.40

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Solution

The fourth proportional to 216.40, 324.52 and 79.40 is: 119.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    216.40 : 324.52 = 79.40 : x
  2. Step 2: Convert to fraction form
    216.40/324.52 = 79.40/x
  3. Step 3: Cross multiply
    216.40x = 324.52 × 79.40
  4. Step 4: Simplify right side
    216.40x = 25,766.89
  5. Step 5: Solve for x
    x = 25,766.89/216.40
  6. Step 6: Final answer
    x = 119.07

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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.