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Finding the Fourth Proportional to 12,626.80, 17,436 and 7,919.20

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Solution

The fourth proportional to 12,626.80, 17,436 and 7,919.20 is: 10,935.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,626.80 : 17,436 = 7,919.20 : x
  2. Step 2: Convert to fraction form
    12,626.80/17,436 = 7,919.20/x
  3. Step 3: Cross multiply
    12,626.80x = 17,436 × 7,919.20
  4. Step 4: Simplify right side
    12,626.80x = 138,079,171.20
  5. Step 5: Solve for x
    x = 138,079,171.20/12,626.80
  6. Step 6: Final answer
    x = 10,935.40

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.