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Finding the Fourth Proportional to 18,984.57, 28,479.90 and 9,620.80

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Solution

The fourth proportional to 18,984.57, 28,479.90 and 9,620.80 is: 14,432.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,984.57 : 28,479.90 = 9,620.80 : x
  2. Step 2: Convert to fraction form
    18,984.57/28,479.90 = 9,620.80/x
  3. Step 3: Cross multiply
    18,984.57x = 28,479.90 × 9,620.80
  4. Step 4: Simplify right side
    18,984.57x = 273,999,314.64
  5. Step 5: Solve for x
    x = 273,999,314.64/18,984.57
  6. Step 6: Final answer
    x = 14,432.73

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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.