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Finding the Fourth Proportional to 8,172, 11,278.32 and 4,860

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Solution

The fourth proportional to 8,172, 11,278.32 and 4,860 is: 6,707.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,172 : 11,278.32 = 4,860 : x
  2. Step 2: Convert to fraction form
    8,172/11,278.32 = 4,860/x
  3. Step 3: Cross multiply
    8,172x = 11,278.32 × 4,860
  4. Step 4: Simplify right side
    8,172x = 54,812,635.20
  5. Step 5: Solve for x
    x = 54,812,635.20/8,172
  6. Step 6: Final answer
    x = 6,707.37

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.