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Finding the Fourth Proportional to 436.68, 654.55 and 219.80

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Solution

The fourth proportional to 436.68, 654.55 and 219.80 is: 329.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    436.68 : 654.55 = 219.80 : x
  2. Step 2: Convert to fraction form
    436.68/654.55 = 219.80/x
  3. Step 3: Cross multiply
    436.68x = 654.55 × 219.80
  4. Step 4: Simplify right side
    436.68x = 143,871.18
  5. Step 5: Solve for x
    x = 143,871.18/436.68
  6. Step 6: Final answer
    x = 329.47

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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.