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Finding the Fourth Proportional to 9,079.80, 13,619.70 and 7,438.20

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Solution

The fourth proportional to 9,079.80, 13,619.70 and 7,438.20 is: 11,157.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,079.80 : 13,619.70 = 7,438.20 : x
  2. Step 2: Convert to fraction form
    9,079.80/13,619.70 = 7,438.20/x
  3. Step 3: Cross multiply
    9,079.80x = 13,619.70 × 7,438.20
  4. Step 4: Simplify right side
    9,079.80x = 101,306,052.54
  5. Step 5: Solve for x
    x = 101,306,052.54/9,079.80
  6. Step 6: Final answer
    x = 11,157.30

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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.