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Finding the Fourth Proportional to 19,813.90, 29,719.77 and 6,664.90

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Solution

The fourth proportional to 19,813.90, 29,719.77 and 6,664.90 is: 9,996.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,813.90 : 29,719.77 = 6,664.90 : x
  2. Step 2: Convert to fraction form
    19,813.90/29,719.77 = 6,664.90/x
  3. Step 3: Cross multiply
    19,813.90x = 29,719.77 × 6,664.90
  4. Step 4: Simplify right side
    19,813.90x = 198,079,295.07
  5. Step 5: Solve for x
    x = 198,079,295.07/19,813.90
  6. Step 6: Final answer
    x = 9,996.99

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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.