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Finding the Fourth Proportional to 20,999.56, 31,506.99 and 9,760.09

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Solution

The fourth proportional to 20,999.56, 31,506.99 and 9,760.09 is: 14,643.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,999.56 : 31,506.99 = 9,760.09 : x
  2. Step 2: Convert to fraction form
    20,999.56/31,506.99 = 9,760.09/x
  3. Step 3: Cross multiply
    20,999.56x = 31,506.99 × 9,760.09
  4. Step 4: Simplify right side
    20,999.56x = 307,511,058.03
  5. Step 5: Solve for x
    x = 307,511,058.03/20,999.56
  6. Step 6: Final answer
    x = 14,643.69

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1.5x scale

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.