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Finding the Fourth Proportional to 1,072.78, 1,608.10 and 553.03

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Solution

The fourth proportional to 1,072.78, 1,608.10 and 553.03 is: 828.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,072.78 : 1,608.10 = 553.03 : x
  2. Step 2: Convert to fraction form
    1,072.78/1,608.10 = 553.03/x
  3. Step 3: Cross multiply
    1,072.78x = 1,608.10 × 553.03
  4. Step 4: Simplify right side
    1,072.78x = 889,327.54
  5. Step 5: Solve for x
    x = 889,327.54/1,072.78
  6. Step 6: Final answer
    x = 828.99

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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.