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Finding the Fourth Proportional to 12,750.62, 19,128.63 and 3,986.20

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Solution

The fourth proportional to 12,750.62, 19,128.63 and 3,986.20 is: 5,980.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,750.62 : 19,128.63 = 3,986.20 : x
  2. Step 2: Convert to fraction form
    12,750.62/19,128.63 = 3,986.20/x
  3. Step 3: Cross multiply
    12,750.62x = 19,128.63 × 3,986.20
  4. Step 4: Simplify right side
    12,750.62x = 76,250,449.26
  5. Step 5: Solve for x
    x = 76,250,449.26/12,750.62
  6. Step 6: Final answer
    x = 5,980.14

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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.