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Finding the Fourth Proportional to 28,433, 42,653.01 and 12,638

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Solution

The fourth proportional to 28,433, 42,653.01 and 12,638 is: 18,958.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,433 : 42,653.01 = 12,638 : x
  2. Step 2: Convert to fraction form
    28,433/42,653.01 = 12,638/x
  3. Step 3: Cross multiply
    28,433x = 42,653.01 × 12,638
  4. Step 4: Simplify right side
    28,433x = 539,048,740.38
  5. Step 5: Solve for x
    x = 539,048,740.38/28,433
  6. Step 6: Final answer
    x = 18,958.56

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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.