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Finding the Fourth Proportional to 20,486.12, 30,739.24 and 7,339.55

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Solution

The fourth proportional to 20,486.12, 30,739.24 and 7,339.55 is: 11,012.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,486.12 : 30,739.24 = 7,339.55 : x
  2. Step 2: Convert to fraction form
    20,486.12/30,739.24 = 7,339.55/x
  3. Step 3: Cross multiply
    20,486.12x = 30,739.24 × 7,339.55
  4. Step 4: Simplify right side
    20,486.12x = 225,612,188.94
  5. Step 5: Solve for x
    x = 225,612,188.94/20,486.12
  6. Step 6: Final answer
    x = 11,012.93

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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.