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Finding the Fourth Proportional to 8,667.70, 12,992.87 and 4,288.34

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Solution

The fourth proportional to 8,667.70, 12,992.87 and 4,288.34 is: 6,428.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,667.70 : 12,992.87 = 4,288.34 : x
  2. Step 2: Convert to fraction form
    8,667.70/12,992.87 = 4,288.34/x
  3. Step 3: Cross multiply
    8,667.70x = 12,992.87 × 4,288.34
  4. Step 4: Simplify right side
    8,667.70x = 55,717,844.14
  5. Step 5: Solve for x
    x = 55,717,844.14/8,667.70
  6. Step 6: Final answer
    x = 6,428.22

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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.