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Finding the Fourth Proportional to 3,586.28, 5,379.18 and 989

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Solution

The fourth proportional to 3,586.28, 5,379.18 and 989 is: 1,483.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,586.28 : 5,379.18 = 989 : x
  2. Step 2: Convert to fraction form
    3,586.28/5,379.18 = 989/x
  3. Step 3: Cross multiply
    3,586.28x = 5,379.18 × 989
  4. Step 4: Simplify right side
    3,586.28x = 5,320,009.02
  5. Step 5: Solve for x
    x = 5,320,009.02/3,586.28
  6. Step 6: Final answer
    x = 1,483.43

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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.