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Finding the Fourth Proportional to 19,980, 29,971.44 and 7,668

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Solution

The fourth proportional to 19,980, 29,971.44 and 7,668 is: 11,502.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,980 : 29,971.44 = 7,668 : x
  2. Step 2: Convert to fraction form
    19,980/29,971.44 = 7,668/x
  3. Step 3: Cross multiply
    19,980x = 29,971.44 × 7,668
  4. Step 4: Simplify right side
    19,980x = 229,821,001.92
  5. Step 5: Solve for x
    x = 229,821,001.92/19,980
  6. Step 6: Final answer
    x = 11,502.55

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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.