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Finding the Fourth Proportional to 18,819.75, 28,240.56 and 8,431.50

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Solution

The fourth proportional to 18,819.75, 28,240.56 and 8,431.50 is: 12,652.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,819.75 : 28,240.56 = 8,431.50 : x
  2. Step 2: Convert to fraction form
    18,819.75/28,240.56 = 8,431.50/x
  3. Step 3: Cross multiply
    18,819.75x = 28,240.56 × 8,431.50
  4. Step 4: Simplify right side
    18,819.75x = 238,110,281.64
  5. Step 5: Solve for x
    x = 238,110,281.64/18,819.75
  6. Step 6: Final answer
    x = 12,652.15

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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.