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Finding the Fourth Proportional to 543, 815.12 and 218.60

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Solution

The fourth proportional to 543, 815.12 and 218.60 is: 328.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    543 : 815.12 = 218.60 : x
  2. Step 2: Convert to fraction form
    543/815.12 = 218.60/x
  3. Step 3: Cross multiply
    543x = 815.12 × 218.60
  4. Step 4: Simplify right side
    543x = 178,185.23
  5. Step 5: Solve for x
    x = 178,185.23/543
  6. Step 6: Final answer
    x = 328.15

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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.