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Finding the Fourth Proportional to 543.53, 815.09 and 218.79

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Solution

The fourth proportional to 543.53, 815.09 and 218.79 is: 328.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    543.53 : 815.09 = 218.79 : x
  2. Step 2: Convert to fraction form
    543.53/815.09 = 218.79/x
  3. Step 3: Cross multiply
    543.53x = 815.09 × 218.79
  4. Step 4: Simplify right side
    543.53x = 178,332.45
  5. Step 5: Solve for x
    x = 178,332.45/543.53
  6. Step 6: Final answer
    x = 328.10

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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.