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Finding the Fourth Proportional to 27,213.80, 40,811.10 and 12,429.80

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Solution

The fourth proportional to 27,213.80, 40,811.10 and 12,429.80 is: 18,640.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    27,213.80 : 40,811.10 = 12,429.80 : x
  2. Step 2: Convert to fraction form
    27,213.80/40,811.10 = 12,429.80/x
  3. Step 3: Cross multiply
    27,213.80x = 40,811.10 × 12,429.80
  4. Step 4: Simplify right side
    27,213.80x = 507,273,810.78
  5. Step 5: Solve for x
    x = 507,273,810.78/27,213.80
  6. Step 6: Final answer
    x = 18,640.32

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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.