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Finding the Fourth Proportional to 12,620.40, 17,290.02 and 12,147.47

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Solution

The fourth proportional to 12,620.40, 17,290.02 and 12,147.47 is: 16,642.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,620.40 : 17,290.02 = 12,147.47 : x
  2. Step 2: Convert to fraction form
    12,620.40/17,290.02 = 12,147.47/x
  3. Step 3: Cross multiply
    12,620.40x = 17,290.02 × 12,147.47
  4. Step 4: Simplify right side
    12,620.40x = 210,029,912.80
  5. Step 5: Solve for x
    x = 210,029,912.80/12,620.40
  6. Step 6: Final answer
    x = 16,642.10

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.