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Finding the Fourth Proportional to 436.99, 655.68 and 220.72

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Solution

The fourth proportional to 436.99, 655.68 and 220.72 is: 331.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    436.99 : 655.68 = 220.72 : x
  2. Step 2: Convert to fraction form
    436.99/655.68 = 220.72/x
  3. Step 3: Cross multiply
    436.99x = 655.68 × 220.72
  4. Step 4: Simplify right side
    436.99x = 144,721.69
  5. Step 5: Solve for x
    x = 144,721.69/436.99
  6. Step 6: Final answer
    x = 331.18

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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.