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Finding the Fourth Proportional to 219.21, 302.61 and 153.96

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Solution

The fourth proportional to 219.21, 302.61 and 153.96 is: 212.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    219.21 : 302.61 = 153.96 : x
  2. Step 2: Convert to fraction form
    219.21/302.61 = 153.96/x
  3. Step 3: Cross multiply
    219.21x = 302.61 × 153.96
  4. Step 4: Simplify right side
    219.21x = 46,589.84
  5. Step 5: Solve for x
    x = 46,589.84/219.21
  6. Step 6: Final answer
    x = 212.54

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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.