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Finding the Fourth Proportional to 8,609.12, 11,861.52 and 7,187.84

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Solution

The fourth proportional to 8,609.12, 11,861.52 and 7,187.84 is: 9,903.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,609.12 : 11,861.52 = 7,187.84 : x
  2. Step 2: Convert to fraction form
    8,609.12/11,861.52 = 7,187.84/x
  3. Step 3: Cross multiply
    8,609.12x = 11,861.52 × 7,187.84
  4. Step 4: Simplify right side
    8,609.12x = 85,258,707.92
  5. Step 5: Solve for x
    x = 85,258,707.92/8,609.12
  6. Step 6: Final answer
    x = 9,903.30

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.