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Finding the Fourth Proportional to 216.82, 299.26 and 128.32

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Solution

The fourth proportional to 216.82, 299.26 and 128.32 is: 177.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    216.82 : 299.26 = 128.32 : x
  2. Step 2: Convert to fraction form
    216.82/299.26 = 128.32/x
  3. Step 3: Cross multiply
    216.82x = 299.26 × 128.32
  4. Step 4: Simplify right side
    216.82x = 38,401.04
  5. Step 5: Solve for x
    x = 38,401.04/216.82
  6. Step 6: Final answer
    x = 177.11

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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.