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Finding the Fourth Proportional to 18,606.54, 25,679.13 and 12,939.78

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Solution

The fourth proportional to 18,606.54, 25,679.13 and 12,939.78 is: 17,858.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,606.54 : 25,679.13 = 12,939.78 : x
  2. Step 2: Convert to fraction form
    18,606.54/25,679.13 = 12,939.78/x
  3. Step 3: Cross multiply
    18,606.54x = 25,679.13 × 12,939.78
  4. Step 4: Simplify right side
    18,606.54x = 332,282,292.79
  5. Step 5: Solve for x
    x = 332,282,292.79/18,606.54
  6. Step 6: Final answer
    x = 17,858.36

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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.