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Finding the Fourth Proportional to 18,970.88, 28,456.31 and 5,119.88

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Solution

The fourth proportional to 18,970.88, 28,456.31 and 5,119.88 is: 7,679.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,970.88 : 28,456.31 = 5,119.88 : x
  2. Step 2: Convert to fraction form
    18,970.88/28,456.31 = 5,119.88/x
  3. Step 3: Cross multiply
    18,970.88x = 28,456.31 × 5,119.88
  4. Step 4: Simplify right side
    18,970.88x = 145,692,762.96
  5. Step 5: Solve for x
    x = 145,692,762.96/18,970.88
  6. Step 6: Final answer
    x = 7,679.81

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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.