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Finding the Fourth Proportional to 19,967.78, 29,930.61 and 7,479.65

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Solution

The fourth proportional to 19,967.78, 29,930.61 and 7,479.65 is: 11,211.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,967.78 : 29,930.61 = 7,479.65 : x
  2. Step 2: Convert to fraction form
    19,967.78/29,930.61 = 7,479.65/x
  3. Step 3: Cross multiply
    19,967.78x = 29,930.61 × 7,479.65
  4. Step 4: Simplify right side
    19,967.78x = 223,870,487.09
  5. Step 5: Solve for x
    x = 223,870,487.09/19,967.78
  6. Step 6: Final answer
    x = 11,211.59

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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.