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Finding the Fourth Proportional to 12,751.20, 19,128.60 and 3,985.20

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Solution

The fourth proportional to 12,751.20, 19,128.60 and 3,985.20 is: 5,978.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,751.20 : 19,128.60 = 3,985.20 : x
  2. Step 2: Convert to fraction form
    12,751.20/19,128.60 = 3,985.20/x
  3. Step 3: Cross multiply
    12,751.20x = 19,128.60 × 3,985.20
  4. Step 4: Simplify right side
    12,751.20x = 76,231,296.72
  5. Step 5: Solve for x
    x = 76,231,296.72/12,751.20
  6. Step 6: Final answer
    x = 5,978.36

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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.