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Finding the Fourth Proportional to 18,420.43, 25,420.81 and 10,355.49

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Solution

The fourth proportional to 18,420.43, 25,420.81 and 10,355.49 is: 14,290.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,420.43 : 25,420.81 = 10,355.49 : x
  2. Step 2: Convert to fraction form
    18,420.43/25,420.81 = 10,355.49/x
  3. Step 3: Cross multiply
    18,420.43x = 25,420.81 × 10,355.49
  4. Step 4: Simplify right side
    18,420.43x = 263,244,891.97
  5. Step 5: Solve for x
    x = 263,244,891.97/18,420.43
  6. Step 6: Final answer
    x = 14,290.92

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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.