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Finding the Fourth Proportional to 7,976.72, 11,908.09 and 7,921.64

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Solution

The fourth proportional to 7,976.72, 11,908.09 and 7,921.64 is: 11,825.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,976.72 : 11,908.09 = 7,921.64 : x
  2. Step 2: Convert to fraction form
    7,976.72/11,908.09 = 7,921.64/x
  3. Step 3: Cross multiply
    7,976.72x = 11,908.09 × 7,921.64
  4. Step 4: Simplify right side
    7,976.72x = 94,331,602.07
  5. Step 5: Solve for x
    x = 94,331,602.07/7,976.72
  6. Step 6: Final answer
    x = 11,825.86

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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.