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Finding the Fourth Proportional to 3,586.78, 5,380.17 and 989.72

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Solution

The fourth proportional to 3,586.78, 5,380.17 and 989.72 is: 1,484.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,586.78 : 5,380.17 = 989.72 : x
  2. Step 2: Convert to fraction form
    3,586.78/5,380.17 = 989.72/x
  3. Step 3: Cross multiply
    3,586.78x = 5,380.17 × 989.72
  4. Step 4: Simplify right side
    3,586.78x = 5,324,856.98
  5. Step 5: Solve for x
    x = 5,324,856.98/3,586.78
  6. Step 6: Final answer
    x = 1,484.58

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1.5x scale

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.