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Finding the Fourth Proportional to 1,181.41, 1,770 and 985.21

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Solution

The fourth proportional to 1,181.41, 1,770 and 985.21 is: 1,476.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,181.41 : 1,770 = 985.21 : x
  2. Step 2: Convert to fraction form
    1,181.41/1,770 = 985.21/x
  3. Step 3: Cross multiply
    1,181.41x = 1,770 × 985.21
  4. Step 4: Simplify right side
    1,181.41x = 1,743,821.70
  5. Step 5: Solve for x
    x = 1,743,821.70/1,181.41
  6. Step 6: Final answer
    x = 1,476.05

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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.