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Finding the Fourth Proportional to 3,586.25, 5,379.38 and 989.19

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Solution

The fourth proportional to 3,586.25, 5,379.38 and 989.19 is: 1,483.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,586.25 : 5,379.38 = 989.19 : x
  2. Step 2: Convert to fraction form
    3,586.25/5,379.38 = 989.19/x
  3. Step 3: Cross multiply
    3,586.25x = 5,379.38 × 989.19
  4. Step 4: Simplify right side
    3,586.25x = 5,321,228.90
  5. Step 5: Solve for x
    x = 5,321,228.90/3,586.25
  6. Step 6: Final answer
    x = 1,483.79

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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.