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Finding the Fourth Proportional to 1,172.06, 1,618.78 and 798.39

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Solution

The fourth proportional to 1,172.06, 1,618.78 and 798.39 is: 1,102.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,172.06 : 1,618.78 = 798.39 : x
  2. Step 2: Convert to fraction form
    1,172.06/1,618.78 = 798.39/x
  3. Step 3: Cross multiply
    1,172.06x = 1,618.78 × 798.39
  4. Step 4: Simplify right side
    1,172.06x = 1,292,419.84
  5. Step 5: Solve for x
    x = 1,292,419.84/1,172.06
  6. Step 6: Final answer
    x = 1,102.69

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.