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Finding the Fourth Proportional to 9,126.80, 13,690.20 and 5,190.20

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Solution

The fourth proportional to 9,126.80, 13,690.20 and 5,190.20 is: 7,785.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,126.80 : 13,690.20 = 5,190.20 : x
  2. Step 2: Convert to fraction form
    9,126.80/13,690.20 = 5,190.20/x
  3. Step 3: Cross multiply
    9,126.80x = 13,690.20 × 5,190.20
  4. Step 4: Simplify right side
    9,126.80x = 71,054,876.04
  5. Step 5: Solve for x
    x = 71,054,876.04/9,126.80
  6. Step 6: Final answer
    x = 7,785.30

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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.