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Finding the Fourth Proportional to 7,951.70, 11,928.84 and 2,686.20

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Solution

The fourth proportional to 7,951.70, 11,928.84 and 2,686.20 is: 4,029.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,951.70 : 11,928.84 = 2,686.20 : x
  2. Step 2: Convert to fraction form
    7,951.70/11,928.84 = 2,686.20/x
  3. Step 3: Cross multiply
    7,951.70x = 11,928.84 × 2,686.20
  4. Step 4: Simplify right side
    7,951.70x = 32,043,250.01
  5. Step 5: Solve for x
    x = 32,043,250.01/7,951.70
  6. Step 6: Final answer
    x = 4,029.74

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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.