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Finding the Fourth Proportional to 19,420.56, 29,108.97 and 7,720.11

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Solution

The fourth proportional to 19,420.56, 29,108.97 and 7,720.11 is: 11,571.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,420.56 : 29,108.97 = 7,720.11 : x
  2. Step 2: Convert to fraction form
    19,420.56/29,108.97 = 7,720.11/x
  3. Step 3: Cross multiply
    19,420.56x = 29,108.97 × 7,720.11
  4. Step 4: Simplify right side
    19,420.56x = 224,724,450.39
  5. Step 5: Solve for x
    x = 224,724,450.39/19,420.56
  6. Step 6: Final answer
    x = 11,571.47

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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.