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Finding the Fourth Proportional to 9,163.70, 12,855.10 and 9,163.70

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Solution

The fourth proportional to 9,163.70, 12,855.10 and 9,163.70 is: 12,855.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,163.70 : 12,855.10 = 9,163.70 : x
  2. Step 2: Convert to fraction form
    9,163.70/12,855.10 = 9,163.70/x
  3. Step 3: Cross multiply
    9,163.70x = 12,855.10 × 9,163.70
  4. Step 4: Simplify right side
    9,163.70x = 117,800,279.87
  5. Step 5: Solve for x
    x = 117,800,279.87/9,163.70
  6. Step 6: Final answer
    x = 12,855.10

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Half scale
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Double scale
Find fourth proportional to 9,164.70, 12,856.50 and 9,164.70
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.