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Finding the Fourth Proportional to 1,099.22, 1,645.64 and 855.01

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Solution

The fourth proportional to 1,099.22, 1,645.64 and 855.01 is: 1,280.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,099.22 : 1,645.64 = 855.01 : x
  2. Step 2: Convert to fraction form
    1,099.22/1,645.64 = 855.01/x
  3. Step 3: Cross multiply
    1,099.22x = 1,645.64 × 855.01
  4. Step 4: Simplify right side
    1,099.22x = 1,407,032.79
  5. Step 5: Solve for x
    x = 1,407,032.79/1,099.22
  6. Step 6: Final answer
    x = 1,280.03

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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.