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Finding the Fourth Proportional to 217.09, 325.51 and 99.82

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Solution

The fourth proportional to 217.09, 325.51 and 99.82 is: 149.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.09 : 325.51 = 99.82 : x
  2. Step 2: Convert to fraction form
    217.09/325.51 = 99.82/x
  3. Step 3: Cross multiply
    217.09x = 325.51 × 99.82
  4. Step 4: Simplify right side
    217.09x = 32,491.19
  5. Step 5: Solve for x
    x = 32,491.19/217.09
  6. Step 6: Final answer
    x = 149.66

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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.