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Finding the Fourth Proportional to 1,099.78, 1,649.73 and 551.41

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Solution

The fourth proportional to 1,099.78, 1,649.73 and 551.41 is: 827.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,099.78 : 1,649.73 = 551.41 : x
  2. Step 2: Convert to fraction form
    1,099.78/1,649.73 = 551.41/x
  3. Step 3: Cross multiply
    1,099.78x = 1,649.73 × 551.41
  4. Step 4: Simplify right side
    1,099.78x = 909,677.62
  5. Step 5: Solve for x
    x = 909,677.62/1,099.78
  6. Step 6: Final answer
    x = 827.15

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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.