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Finding the Fourth Proportional to 19,980.72, 29,984.44 and 8,293.94

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Solution

The fourth proportional to 19,980.72, 29,984.44 and 8,293.94 is: 12,446.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,980.72 : 29,984.44 = 8,293.94 : x
  2. Step 2: Convert to fraction form
    19,980.72/29,984.44 = 8,293.94/x
  3. Step 3: Cross multiply
    19,980.72x = 29,984.44 × 8,293.94
  4. Step 4: Simplify right side
    19,980.72x = 248,689,146.29
  5. Step 5: Solve for x
    x = 248,689,146.29/19,980.72
  6. Step 6: Final answer
    x = 12,446.46

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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.