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Finding the Fourth Proportional to 1,100.78, 1,648.43 and 553.22

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Solution

The fourth proportional to 1,100.78, 1,648.43 and 553.22 is: 828.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,100.78 : 1,648.43 = 553.22 : x
  2. Step 2: Convert to fraction form
    1,100.78/1,648.43 = 553.22/x
  3. Step 3: Cross multiply
    1,100.78x = 1,648.43 × 553.22
  4. Step 4: Simplify right side
    1,100.78x = 911,944.44
  5. Step 5: Solve for x
    x = 911,944.44/1,100.78
  6. Step 6: Final answer
    x = 828.45

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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.