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Finding the Fourth Proportional to 15,392, 21,243.04 and 8,679

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Solution

The fourth proportional to 15,392, 21,243.04 and 8,679 is: 11,978.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,392 : 21,243.04 = 8,679 : x
  2. Step 2: Convert to fraction form
    15,392/21,243.04 = 8,679/x
  3. Step 3: Cross multiply
    15,392x = 21,243.04 × 8,679
  4. Step 4: Simplify right side
    15,392x = 184,368,344.16
  5. Step 5: Solve for x
    x = 184,368,344.16/15,392
  6. Step 6: Final answer
    x = 11,978.19

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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.