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Finding the Fourth Proportional to 12,690.78, 19,036.20 and 3,456.78

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Solution

The fourth proportional to 12,690.78, 19,036.20 and 3,456.78 is: 5,185.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,690.78 : 19,036.20 = 3,456.78 : x
  2. Step 2: Convert to fraction form
    12,690.78/19,036.20 = 3,456.78/x
  3. Step 3: Cross multiply
    12,690.78x = 19,036.20 × 3,456.78
  4. Step 4: Simplify right side
    12,690.78x = 65,803,955.44
  5. Step 5: Solve for x
    x = 65,803,955.44/12,690.78
  6. Step 6: Final answer
    x = 5,185.18

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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.