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Finding the Fourth Proportional to 8,749.19, 13,129.94 and 7,912.66

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Solution

The fourth proportional to 8,749.19, 13,129.94 and 7,912.66 is: 11,874.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,749.19 : 13,129.94 = 7,912.66 : x
  2. Step 2: Convert to fraction form
    8,749.19/13,129.94 = 7,912.66/x
  3. Step 3: Cross multiply
    8,749.19x = 13,129.94 × 7,912.66
  4. Step 4: Simplify right side
    8,749.19x = 103,892,764.08
  5. Step 5: Solve for x
    x = 103,892,764.08/8,749.19
  6. Step 6: Final answer
    x = 11,874.56

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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.