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Finding the Fourth Proportional to 11,771.80, 17,619.30 and 8,315.80

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Solution

The fourth proportional to 11,771.80, 17,619.30 and 8,315.80 is: 12,446.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,771.80 : 17,619.30 = 8,315.80 : x
  2. Step 2: Convert to fraction form
    11,771.80/17,619.30 = 8,315.80/x
  3. Step 3: Cross multiply
    11,771.80x = 17,619.30 × 8,315.80
  4. Step 4: Simplify right side
    11,771.80x = 146,518,574.94
  5. Step 5: Solve for x
    x = 146,518,574.94/11,771.80
  6. Step 6: Final answer
    x = 12,446.57

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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.