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Finding the Fourth Proportional to 12,663, 18,994.86 and 3,429

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Solution

The fourth proportional to 12,663, 18,994.86 and 3,429 is: 5,143.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,663 : 18,994.86 = 3,429 : x
  2. Step 2: Convert to fraction form
    12,663/18,994.86 = 3,429/x
  3. Step 3: Cross multiply
    12,663x = 18,994.86 × 3,429
  4. Step 4: Simplify right side
    12,663x = 65,133,374.94
  5. Step 5: Solve for x
    x = 65,133,374.94/12,663
  6. Step 6: Final answer
    x = 5,143.60

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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.