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Finding the Fourth Proportional to 7,975.72, 11,906.60 and 7,920.64

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Solution

The fourth proportional to 7,975.72, 11,906.60 and 7,920.64 is: 11,824.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,975.72 : 11,906.60 = 7,920.64 : x
  2. Step 2: Convert to fraction form
    7,975.72/11,906.60 = 7,920.64/x
  3. Step 3: Cross multiply
    7,975.72x = 11,906.60 × 7,920.64
  4. Step 4: Simplify right side
    7,975.72x = 94,307,892.22
  5. Step 5: Solve for x
    x = 94,307,892.22/7,975.72
  6. Step 6: Final answer
    x = 11,824.37

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.