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Finding the Fourth Proportional to 12,986, 19,479.36 and 3,752

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Solution

The fourth proportional to 12,986, 19,479.36 and 3,752 is: 5,628.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,986 : 19,479.36 = 3,752 : x
  2. Step 2: Convert to fraction form
    12,986/19,479.36 = 3,752/x
  3. Step 3: Cross multiply
    12,986x = 19,479.36 × 3,752
  4. Step 4: Simplify right side
    12,986x = 73,086,558.72
  5. Step 5: Solve for x
    x = 73,086,558.72/12,986
  6. Step 6: Final answer
    x = 5,628.10

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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.