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Finding the Fourth Proportional to 543.12, 815.49 and 219.12

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Solution

The fourth proportional to 543.12, 815.49 and 219.12 is: 329.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    543.12 : 815.49 = 219.12 : x
  2. Step 2: Convert to fraction form
    543.12/815.49 = 219.12/x
  3. Step 3: Cross multiply
    543.12x = 815.49 × 219.12
  4. Step 4: Simplify right side
    543.12x = 178,690.17
  5. Step 5: Solve for x
    x = 178,690.17/543.12
  6. Step 6: Final answer
    x = 329.01

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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.