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Finding the Fourth Proportional to 9,321.70, 12,863.94 and 5,129.95

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Solution

The fourth proportional to 9,321.70, 12,863.94 and 5,129.95 is: 7,079.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,321.70 : 12,863.94 = 5,129.95 : x
  2. Step 2: Convert to fraction form
    9,321.70/12,863.94 = 5,129.95/x
  3. Step 3: Cross multiply
    9,321.70x = 12,863.94 × 5,129.95
  4. Step 4: Simplify right side
    9,321.70x = 65,991,293.49
  5. Step 5: Solve for x
    x = 65,991,293.49/9,321.70
  6. Step 6: Final answer
    x = 7,079.32

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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.