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Finding the Fourth Proportional to 18,940.20, 28,410.30 and 4,900.20

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Solution

The fourth proportional to 18,940.20, 28,410.30 and 4,900.20 is: 7,350.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,940.20 : 28,410.30 = 4,900.20 : x
  2. Step 2: Convert to fraction form
    18,940.20/28,410.30 = 4,900.20/x
  3. Step 3: Cross multiply
    18,940.20x = 28,410.30 × 4,900.20
  4. Step 4: Simplify right side
    18,940.20x = 139,216,152.06
  5. Step 5: Solve for x
    x = 139,216,152.06/18,940.20
  6. Step 6: Final answer
    x = 7,350.30

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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.