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Finding the Fourth Proportional to 28,158.62, 42,231.81 and 8,431.88

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Solution

The fourth proportional to 28,158.62, 42,231.81 and 8,431.88 is: 12,645.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,158.62 : 42,231.81 = 8,431.88 : x
  2. Step 2: Convert to fraction form
    28,158.62/42,231.81 = 8,431.88/x
  3. Step 3: Cross multiply
    28,158.62x = 42,231.81 × 8,431.88
  4. Step 4: Simplify right side
    28,158.62x = 356,093,554.10
  5. Step 5: Solve for x
    x = 356,093,554.10/28,158.62
  6. Step 6: Final answer
    x = 12,645.99

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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.