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Finding the Fourth Proportional to 13,390.40, 20,079.06 and 5,491.50

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Solution

The fourth proportional to 13,390.40, 20,079.06 and 5,491.50 is: 8,234.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,390.40 : 20,079.06 = 5,491.50 : x
  2. Step 2: Convert to fraction form
    13,390.40/20,079.06 = 5,491.50/x
  3. Step 3: Cross multiply
    13,390.40x = 20,079.06 × 5,491.50
  4. Step 4: Simplify right side
    13,390.40x = 110,264,108.43
  5. Step 5: Solve for x
    x = 110,264,108.43/13,390.40
  6. Step 6: Final answer
    x = 8,234.56

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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.