Home / 18,905.40-28,374.30-8,391.60

Finding the Fourth Proportional to 18,905.40, 28,374.30 and 8,391.60

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Solution

The fourth proportional to 18,905.40, 28,374.30 and 8,391.60 is: 12,594.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,905.40 : 28,374.30 = 8,391.60 : x
  2. Step 2: Convert to fraction form
    18,905.40/28,374.30 = 8,391.60/x
  3. Step 3: Cross multiply
    18,905.40x = 28,374.30 × 8,391.60
  4. Step 4: Simplify right side
    18,905.40x = 238,105,775.88
  5. Step 5: Solve for x
    x = 238,105,775.88/18,905.40
  6. Step 6: Final answer
    x = 12,594.59

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.