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Finding the Fourth Proportional to 12,673.54, 18,989.79 and 7,728.22

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Solution

The fourth proportional to 12,673.54, 18,989.79 and 7,728.22 is: 11,579.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,673.54 : 18,989.79 = 7,728.22 : x
  2. Step 2: Convert to fraction form
    12,673.54/18,989.79 = 7,728.22/x
  3. Step 3: Cross multiply
    12,673.54x = 18,989.79 × 7,728.22
  4. Step 4: Simplify right side
    12,673.54x = 146,757,274.87
  5. Step 5: Solve for x
    x = 146,757,274.87/12,673.54
  6. Step 6: Final answer
    x = 11,579.82

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.