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Finding the Fourth Proportional to 9,190.80, 13,786.20 and 7,117.20

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Solution

The fourth proportional to 9,190.80, 13,786.20 and 7,117.20 is: 10,675.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,190.80 : 13,786.20 = 7,117.20 : x
  2. Step 2: Convert to fraction form
    9,190.80/13,786.20 = 7,117.20/x
  3. Step 3: Cross multiply
    9,190.80x = 13,786.20 × 7,117.20
  4. Step 4: Simplify right side
    9,190.80x = 98,119,142.64
  5. Step 5: Solve for x
    x = 98,119,142.64/9,190.80
  6. Step 6: Final answer
    x = 10,675.80

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Double scale
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Similar ratio
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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.