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Finding the Fourth Proportional to 11,375.64, 15,697.80 and 7,839.18

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Solution

The fourth proportional to 11,375.64, 15,697.80 and 7,839.18 is: 10,817.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,375.64 : 15,697.80 = 7,839.18 : x
  2. Step 2: Convert to fraction form
    11,375.64/15,697.80 = 7,839.18/x
  3. Step 3: Cross multiply
    11,375.64x = 15,697.80 × 7,839.18
  4. Step 4: Simplify right side
    11,375.64x = 123,057,879.80
  5. Step 5: Solve for x
    x = 123,057,879.80/11,375.64
  6. Step 6: Final answer
    x = 10,817.67

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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.