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Finding the Fourth Proportional to 20,888.96, 31,336.13 and 7,739.96

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Solution

The fourth proportional to 20,888.96, 31,336.13 and 7,739.96 is: 11,610.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,888.96 : 31,336.13 = 7,739.96 : x
  2. Step 2: Convert to fraction form
    20,888.96/31,336.13 = 7,739.96/x
  3. Step 3: Cross multiply
    20,888.96x = 31,336.13 × 7,739.96
  4. Step 4: Simplify right side
    20,888.96x = 242,540,255.42
  5. Step 5: Solve for x
    x = 242,540,255.42/20,888.96
  6. Step 6: Final answer
    x = 11,610.93

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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.