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Finding the Fourth Proportional to 279.75, 420.57 and 219

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Solution

The fourth proportional to 279.75, 420.57 and 219 is: 329.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.75 : 420.57 = 219 : x
  2. Step 2: Convert to fraction form
    279.75/420.57 = 219/x
  3. Step 3: Cross multiply
    279.75x = 420.57 × 219
  4. Step 4: Simplify right side
    279.75x = 92,104.83
  5. Step 5: Solve for x
    x = 92,104.83/279.75
  6. Step 6: Final answer
    x = 329.24

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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.