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Finding the Fourth Proportional to 551.21, 826.81 and 243

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Solution

The fourth proportional to 551.21, 826.81 and 243 is: 364.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    551.21 : 826.81 = 243 : x
  2. Step 2: Convert to fraction form
    551.21/826.81 = 243/x
  3. Step 3: Cross multiply
    551.21x = 826.81 × 243
  4. Step 4: Simplify right side
    551.21x = 200,914.22
  5. Step 5: Solve for x
    x = 200,914.22/551.21
  6. Step 6: Final answer
    x = 364.50

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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.