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Finding the Fourth Proportional to 216.75, 325.09 and 70.61

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Solution

The fourth proportional to 216.75, 325.09 and 70.61 is: 105.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    216.75 : 325.09 = 70.61 : x
  2. Step 2: Convert to fraction form
    216.75/325.09 = 70.61/x
  3. Step 3: Cross multiply
    216.75x = 325.09 × 70.61
  4. Step 4: Simplify right side
    216.75x = 22,952.77
  5. Step 5: Solve for x
    x = 22,952.77/216.75
  6. Step 6: Final answer
    x = 105.89

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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.