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Finding the Fourth Proportional to 1,083.36, 1,621.20 and 985.44

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Solution

The fourth proportional to 1,083.36, 1,621.20 and 985.44 is: 1,474.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,083.36 : 1,621.20 = 985.44 : x
  2. Step 2: Convert to fraction form
    1,083.36/1,621.20 = 985.44/x
  3. Step 3: Cross multiply
    1,083.36x = 1,621.20 × 985.44
  4. Step 4: Simplify right side
    1,083.36x = 1,597,595.33
  5. Step 5: Solve for x
    x = 1,597,595.33/1,083.36
  6. Step 6: Final answer
    x = 1,474.67

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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.