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Finding the Fourth Proportional to 18,687.78, 25,769.40 and 14,439.60

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Solution

The fourth proportional to 18,687.78, 25,769.40 and 14,439.60 is: 19,911.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,687.78 : 25,769.40 = 14,439.60 : x
  2. Step 2: Convert to fraction form
    18,687.78/25,769.40 = 14,439.60/x
  3. Step 3: Cross multiply
    18,687.78x = 25,769.40 × 14,439.60
  4. Step 4: Simplify right side
    18,687.78x = 372,099,828.24
  5. Step 5: Solve for x
    x = 372,099,828.24/18,687.78
  6. Step 6: Final answer
    x = 19,911.40

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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.