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Finding the Fourth Proportional to 28,143.60, 42,223.86 and 8,422.80

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Solution

The fourth proportional to 28,143.60, 42,223.86 and 8,422.80 is: 12,636.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,143.60 : 42,223.86 = 8,422.80 : x
  2. Step 2: Convert to fraction form
    28,143.60/42,223.86 = 8,422.80/x
  3. Step 3: Cross multiply
    28,143.60x = 42,223.86 × 8,422.80
  4. Step 4: Simplify right side
    28,143.60x = 355,643,128.01
  5. Step 5: Solve for x
    x = 355,643,128.01/28,143.60
  6. Step 6: Final answer
    x = 12,636.73

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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.