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Finding the Fourth Proportional to 18,880.91, 28,321.36 and 8,990.20

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Solution

The fourth proportional to 18,880.91, 28,321.36 and 8,990.20 is: 13,485.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,880.91 : 28,321.36 = 8,990.20 : x
  2. Step 2: Convert to fraction form
    18,880.91/28,321.36 = 8,990.20/x
  3. Step 3: Cross multiply
    18,880.91x = 28,321.36 × 8,990.20
  4. Step 4: Simplify right side
    18,880.91x = 254,614,690.67
  5. Step 5: Solve for x
    x = 254,614,690.67/18,880.91
  6. Step 6: Final answer
    x = 13,485.30

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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.