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Finding the Fourth Proportional to 3,586.21, 5,379.59 and 989.13

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Solution

The fourth proportional to 3,586.21, 5,379.59 and 989.13 is: 1,483.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,586.21 : 5,379.59 = 989.13 : x
  2. Step 2: Convert to fraction form
    3,586.21/5,379.59 = 989.13/x
  3. Step 3: Cross multiply
    3,586.21x = 5,379.59 × 989.13
  4. Step 4: Simplify right side
    3,586.21x = 5,321,113.86
  5. Step 5: Solve for x
    x = 5,321,113.86/3,586.21
  6. Step 6: Final answer
    x = 1,483.77

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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.