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Finding the Fourth Proportional to 18,684.89, 25,786.43 and 11,420.10

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Solution

The fourth proportional to 18,684.89, 25,786.43 and 11,420.10 is: 15,760.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,684.89 : 25,786.43 = 11,420.10 : x
  2. Step 2: Convert to fraction form
    18,684.89/25,786.43 = 11,420.10/x
  3. Step 3: Cross multiply
    18,684.89x = 25,786.43 × 11,420.10
  4. Step 4: Simplify right side
    18,684.89x = 294,483,423.21
  5. Step 5: Solve for x
    x = 294,483,423.21/18,684.89
  6. Step 6: Final answer
    x = 15,760.52

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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.