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Finding the Fourth Proportional to 18,693.31, 25,793.80 and 11,139.45

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Solution

The fourth proportional to 18,693.31, 25,793.80 and 11,139.45 is: 15,370.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,693.31 : 25,793.80 = 11,139.45 : x
  2. Step 2: Convert to fraction form
    18,693.31/25,793.80 = 11,139.45/x
  3. Step 3: Cross multiply
    18,693.31x = 25,793.80 × 11,139.45
  4. Step 4: Simplify right side
    18,693.31x = 287,328,745.41
  5. Step 5: Solve for x
    x = 287,328,745.41/18,693.31
  6. Step 6: Final answer
    x = 15,370.67

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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.