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Finding the Fourth Proportional to 19,811.90, 29,716.77 and 6,662.90

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Solution

The fourth proportional to 19,811.90, 29,716.77 and 6,662.90 is: 9,993.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,811.90 : 29,716.77 = 6,662.90 : x
  2. Step 2: Convert to fraction form
    19,811.90/29,716.77 = 6,662.90/x
  3. Step 3: Cross multiply
    19,811.90x = 29,716.77 × 6,662.90
  4. Step 4: Simplify right side
    19,811.90x = 197,999,866.83
  5. Step 5: Solve for x
    x = 197,999,866.83/19,811.90
  6. Step 6: Final answer
    x = 9,993.99

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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.