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Finding the Fourth Proportional to 12,947, 19,420.50 and 3,219

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Solution

The fourth proportional to 12,947, 19,420.50 and 3,219 is: 4,828.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,947 : 19,420.50 = 3,219 : x
  2. Step 2: Convert to fraction form
    12,947/19,420.50 = 3,219/x
  3. Step 3: Cross multiply
    12,947x = 19,420.50 × 3,219
  4. Step 4: Simplify right side
    12,947x = 62,514,589.50
  5. Step 5: Solve for x
    x = 62,514,589.50/12,947
  6. Step 6: Final answer
    x = 4,828.50

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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.