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Finding the Fourth Proportional to 28,620.42, 42,930.15 and 7,843.92

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Solution

The fourth proportional to 28,620.42, 42,930.15 and 7,843.92 is: 11,765.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,620.42 : 42,930.15 = 7,843.92 : x
  2. Step 2: Convert to fraction form
    28,620.42/42,930.15 = 7,843.92/x
  3. Step 3: Cross multiply
    28,620.42x = 42,930.15 × 7,843.92
  4. Step 4: Simplify right side
    28,620.42x = 336,740,662.19
  5. Step 5: Solve for x
    x = 336,740,662.19/28,620.42
  6. Step 6: Final answer
    x = 11,765.75

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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.