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Finding the Fourth Proportional to 15,790.85, 21,789.25 and 8,985.03

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Solution

The fourth proportional to 15,790.85, 21,789.25 and 8,985.03 is: 12,398.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,790.85 : 21,789.25 = 8,985.03 : x
  2. Step 2: Convert to fraction form
    15,790.85/21,789.25 = 8,985.03/x
  3. Step 3: Cross multiply
    15,790.85x = 21,789.25 × 8,985.03
  4. Step 4: Simplify right side
    15,790.85x = 195,777,011.30
  5. Step 5: Solve for x
    x = 195,777,011.30/15,790.85
  6. Step 6: Final answer
    x = 12,398.13

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.