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Finding the Fourth Proportional to 20,395.20, 30,578.40 and 7,910.40

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Solution

The fourth proportional to 20,395.20, 30,578.40 and 7,910.40 is: 11,860.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,395.20 : 30,578.40 = 7,910.40 : x
  2. Step 2: Convert to fraction form
    20,395.20/30,578.40 = 7,910.40/x
  3. Step 3: Cross multiply
    20,395.20x = 30,578.40 × 7,910.40
  4. Step 4: Simplify right side
    20,395.20x = 241,887,375.36
  5. Step 5: Solve for x
    x = 241,887,375.36/20,395.20
  6. Step 6: Final answer
    x = 11,860.01

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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.