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Finding the Fourth Proportional to 20,486.10, 30,738.90 and 7,339.80

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Solution

The fourth proportional to 20,486.10, 30,738.90 and 7,339.80 is: 11,013.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,486.10 : 30,738.90 = 7,339.80 : x
  2. Step 2: Convert to fraction form
    20,486.10/30,738.90 = 7,339.80/x
  3. Step 3: Cross multiply
    20,486.10x = 30,738.90 × 7,339.80
  4. Step 4: Simplify right side
    20,486.10x = 225,617,378.22
  5. Step 5: Solve for x
    x = 225,617,378.22/20,486.10
  6. Step 6: Final answer
    x = 11,013.19

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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.