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Finding the Fourth Proportional to 8,489.79, 12,739.64 and 3,559.01

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Solution

The fourth proportional to 8,489.79, 12,739.64 and 3,559.01 is: 5,340.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,489.79 : 12,739.64 = 3,559.01 : x
  2. Step 2: Convert to fraction form
    8,489.79/12,739.64 = 3,559.01/x
  3. Step 3: Cross multiply
    8,489.79x = 12,739.64 × 3,559.01
  4. Step 4: Simplify right side
    8,489.79x = 45,340,506.16
  5. Step 5: Solve for x
    x = 45,340,506.16/8,489.79
  6. Step 6: Final answer
    x = 5,340.59

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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.