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Finding the Fourth Proportional to 827.84, 1,241.76 and 211.60

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Solution

The fourth proportional to 827.84, 1,241.76 and 211.60 is: 317.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    827.84 : 1,241.76 = 211.60 : x
  2. Step 2: Convert to fraction form
    827.84/1,241.76 = 211.60/x
  3. Step 3: Cross multiply
    827.84x = 1,241.76 × 211.60
  4. Step 4: Simplify right side
    827.84x = 262,756.42
  5. Step 5: Solve for x
    x = 262,756.42/827.84
  6. Step 6: Final answer
    x = 317.40

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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.