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Finding the Fourth Proportional to 220.19, 304.64 and 216.31

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Solution

The fourth proportional to 220.19, 304.64 and 216.31 is: 299.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.19 : 304.64 = 216.31 : x
  2. Step 2: Convert to fraction form
    220.19/304.64 = 216.31/x
  3. Step 3: Cross multiply
    220.19x = 304.64 × 216.31
  4. Step 4: Simplify right side
    220.19x = 65,895.65
  5. Step 5: Solve for x
    x = 65,895.65/220.19
  6. Step 6: Final answer
    x = 299.27

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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.