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Finding the Fourth Proportional to 217.24, 299.64 and 155.02

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Solution

The fourth proportional to 217.24, 299.64 and 155.02 is: 213.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.24 : 299.64 = 155.02 : x
  2. Step 2: Convert to fraction form
    217.24/299.64 = 155.02/x
  3. Step 3: Cross multiply
    217.24x = 299.64 × 155.02
  4. Step 4: Simplify right side
    217.24x = 46,450.19
  5. Step 5: Solve for x
    x = 46,450.19/217.24
  6. Step 6: Final answer
    x = 213.82

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.