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Finding the Fourth Proportional to 18,783, 25,920.54 and 10,399.50

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Solution

The fourth proportional to 18,783, 25,920.54 and 10,399.50 is: 14,351.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,783 : 25,920.54 = 10,399.50 : x
  2. Step 2: Convert to fraction form
    18,783/25,920.54 = 10,399.50/x
  3. Step 3: Cross multiply
    18,783x = 25,920.54 × 10,399.50
  4. Step 4: Simplify right side
    18,783x = 269,560,655.73
  5. Step 5: Solve for x
    x = 269,560,655.73/18,783
  6. Step 6: Final answer
    x = 14,351.31

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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.