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Finding the Fourth Proportional to 8,289.64, 12,431.46 and 3,609.40

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Solution

The fourth proportional to 8,289.64, 12,431.46 and 3,609.40 is: 5,412.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,289.64 : 12,431.46 = 3,609.40 : x
  2. Step 2: Convert to fraction form
    8,289.64/12,431.46 = 3,609.40/x
  3. Step 3: Cross multiply
    8,289.64x = 12,431.46 × 3,609.40
  4. Step 4: Simplify right side
    8,289.64x = 44,870,111.72
  5. Step 5: Solve for x
    x = 44,870,111.72/8,289.64
  6. Step 6: Final answer
    x = 5,412.79

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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.