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Finding the Fourth Proportional to 3,586.54, 5,380.12 and 989.48

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Solution

The fourth proportional to 3,586.54, 5,380.12 and 989.48 is: 1,484.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,586.54 : 5,380.12 = 989.48 : x
  2. Step 2: Convert to fraction form
    3,586.54/5,380.12 = 989.48/x
  3. Step 3: Cross multiply
    3,586.54x = 5,380.12 × 989.48
  4. Step 4: Simplify right side
    3,586.54x = 5,323,516.27
  5. Step 5: Solve for x
    x = 5,323,516.27/3,586.54
  6. Step 6: Final answer
    x = 1,484.30

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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.