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Finding the Fourth Proportional to 827.34, 1,245.93 and 720.42

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Solution

The fourth proportional to 827.34, 1,245.93 and 720.42 is: 1,084.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    827.34 : 1,245.93 = 720.42 : x
  2. Step 2: Convert to fraction form
    827.34/1,245.93 = 720.42/x
  3. Step 3: Cross multiply
    827.34x = 1,245.93 × 720.42
  4. Step 4: Simplify right side
    827.34x = 897,592.89
  5. Step 5: Solve for x
    x = 897,592.89/827.34
  6. Step 6: Final answer
    x = 1,084.91

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.