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Finding the Fourth Proportional to 1,175.49, 1,618.49 and 998.09

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Solution

The fourth proportional to 1,175.49, 1,618.49 and 998.09 is: 1,374.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,175.49 : 1,618.49 = 998.09 : x
  2. Step 2: Convert to fraction form
    1,175.49/1,618.49 = 998.09/x
  3. Step 3: Cross multiply
    1,175.49x = 1,618.49 × 998.09
  4. Step 4: Simplify right side
    1,175.49x = 1,615,389.34
  5. Step 5: Solve for x
    x = 1,615,389.34/1,175.49
  6. Step 6: Final answer
    x = 1,374.22

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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.