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Finding the Fourth Proportional to 543.92, 815.91 and 219.28

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Solution

The fourth proportional to 543.92, 815.91 and 219.28 is: 328.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    543.92 : 815.91 = 219.28 : x
  2. Step 2: Convert to fraction form
    543.92/815.91 = 219.28/x
  3. Step 3: Cross multiply
    543.92x = 815.91 × 219.28
  4. Step 4: Simplify right side
    543.92x = 178,911.65
  5. Step 5: Solve for x
    x = 178,911.65/543.92
  6. Step 6: Final answer
    x = 328.93

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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.