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Finding the Fourth Proportional to 543.79, 815.37 and 218.77

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Solution

The fourth proportional to 543.79, 815.37 and 218.77 is: 328.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    543.79 : 815.37 = 218.77 : x
  2. Step 2: Convert to fraction form
    543.79/815.37 = 218.77/x
  3. Step 3: Cross multiply
    543.79x = 815.37 × 218.77
  4. Step 4: Simplify right side
    543.79x = 178,378.49
  5. Step 5: Solve for x
    x = 178,378.49/543.79
  6. Step 6: Final answer
    x = 328.03

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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.