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Finding the Fourth Proportional to 6,911.78, 9,538.79 and 3,928.55

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Solution

The fourth proportional to 6,911.78, 9,538.79 and 3,928.55 is: 5,421.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,911.78 : 9,538.79 = 3,928.55 : x
  2. Step 2: Convert to fraction form
    6,911.78/9,538.79 = 3,928.55/x
  3. Step 3: Cross multiply
    6,911.78x = 9,538.79 × 3,928.55
  4. Step 4: Simplify right side
    6,911.78x = 37,473,546.12
  5. Step 5: Solve for x
    x = 37,473,546.12/6,911.78
  6. Step 6: Final answer
    x = 5,421.70

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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.