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Finding the Fourth Proportional to 8,423.99, 12,629.13 and 3,156.05

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Solution

The fourth proportional to 8,423.99, 12,629.13 and 3,156.05 is: 4,731.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,423.99 : 12,629.13 = 3,156.05 : x
  2. Step 2: Convert to fraction form
    8,423.99/12,629.13 = 3,156.05/x
  3. Step 3: Cross multiply
    8,423.99x = 12,629.13 × 3,156.05
  4. Step 4: Simplify right side
    8,423.99x = 39,858,185.47
  5. Step 5: Solve for x
    x = 39,858,185.47/8,423.99
  6. Step 6: Final answer
    x = 4,731.51

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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.