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Finding the Fourth Proportional to 18,783.89, 25,921.77 and 10,400.39

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Solution

The fourth proportional to 18,783.89, 25,921.77 and 10,400.39 is: 14,352.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,783.89 : 25,921.77 = 10,400.39 : x
  2. Step 2: Convert to fraction form
    18,783.89/25,921.77 = 10,400.39/x
  3. Step 3: Cross multiply
    18,783.89x = 25,921.77 × 10,400.39
  4. Step 4: Simplify right side
    18,783.89x = 269,596,517.49
  5. Step 5: Solve for x
    x = 269,596,517.49/18,783.89
  6. Step 6: Final answer
    x = 14,352.54

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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.