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Finding the Fourth Proportional to 28,443.11, 42,659.81 and 7,661.75

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Solution

The fourth proportional to 28,443.11, 42,659.81 and 7,661.75 is: 11,491.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,443.11 : 42,659.81 = 7,661.75 : x
  2. Step 2: Convert to fraction form
    28,443.11/42,659.81 = 7,661.75/x
  3. Step 3: Cross multiply
    28,443.11x = 42,659.81 × 7,661.75
  4. Step 4: Simplify right side
    28,443.11x = 326,848,760.96
  5. Step 5: Solve for x
    x = 326,848,760.96/28,443.11
  6. Step 6: Final answer
    x = 11,491.32

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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.