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Finding the Fourth Proportional to 19,620.61, 29,430.92 and 5,769.61

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Solution

The fourth proportional to 19,620.61, 29,430.92 and 5,769.61 is: 8,654.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,620.61 : 29,430.92 = 5,769.61 : x
  2. Step 2: Convert to fraction form
    19,620.61/29,430.92 = 5,769.61/x
  3. Step 3: Cross multiply
    19,620.61x = 29,430.92 × 5,769.61
  4. Step 4: Simplify right side
    19,620.61x = 169,804,990.30
  5. Step 5: Solve for x
    x = 169,804,990.30/19,620.61
  6. Step 6: Final answer
    x = 8,654.42

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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.