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Finding the Fourth Proportional to 8,145.70, 12,211.35 and 4,855.30

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Solution

The fourth proportional to 8,145.70, 12,211.35 and 4,855.30 is: 7,278.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,145.70 : 12,211.35 = 4,855.30 : x
  2. Step 2: Convert to fraction form
    8,145.70/12,211.35 = 4,855.30/x
  3. Step 3: Cross multiply
    8,145.70x = 12,211.35 × 4,855.30
  4. Step 4: Simplify right side
    8,145.70x = 59,289,767.66
  5. Step 5: Solve for x
    x = 59,289,767.66/8,145.70
  6. Step 6: Final answer
    x = 7,278.66

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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.