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Finding the Fourth Proportional to 827.73, 1,239.16 and 553.14

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Solution

The fourth proportional to 827.73, 1,239.16 and 553.14 is: 828.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    827.73 : 1,239.16 = 553.14 : x
  2. Step 2: Convert to fraction form
    827.73/1,239.16 = 553.14/x
  3. Step 3: Cross multiply
    827.73x = 1,239.16 × 553.14
  4. Step 4: Simplify right side
    827.73x = 685,428.96
  5. Step 5: Solve for x
    x = 685,428.96/827.73
  6. Step 6: Final answer
    x = 828.08

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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.