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Finding the Fourth Proportional to 18,405.80, 25,374.48 and 12,428.00

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Solution

The fourth proportional to 18,405.80, 25,374.48 and 12,428.00 is: 17,133.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,405.80 : 25,374.48 = 12,428.00 : x
  2. Step 2: Convert to fraction form
    18,405.80/25,374.48 = 12,428.00/x
  3. Step 3: Cross multiply
    18,405.80x = 25,374.48 × 12,428.00
  4. Step 4: Simplify right side
    18,405.80x = 315,353,910.57
  5. Step 5: Solve for x
    x = 315,353,910.57/18,405.80
  6. Step 6: Final answer
    x = 17,133.40

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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.