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Finding the Fourth Proportional to 18,679.56, 25,788.34 and 12,400.52

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Solution

The fourth proportional to 18,679.56, 25,788.34 and 12,400.52 is: 17,119.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,679.56 : 25,788.34 = 12,400.52 : x
  2. Step 2: Convert to fraction form
    18,679.56/25,788.34 = 12,400.52/x
  3. Step 3: Cross multiply
    18,679.56x = 25,788.34 × 12,400.52
  4. Step 4: Simplify right side
    18,679.56x = 319,788,825.94
  5. Step 5: Solve for x
    x = 319,788,825.94/18,679.56
  6. Step 6: Final answer
    x = 17,119.72

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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.