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Finding the Fourth Proportional to 12,643, 18,964.50 and 3,409

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Solution

The fourth proportional to 12,643, 18,964.50 and 3,409 is: 5,113.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,643 : 18,964.50 = 3,409 : x
  2. Step 2: Convert to fraction form
    12,643/18,964.50 = 3,409/x
  3. Step 3: Cross multiply
    12,643x = 18,964.50 × 3,409
  4. Step 4: Simplify right side
    12,643x = 64,649,980.50
  5. Step 5: Solve for x
    x = 64,649,980.50/12,643
  6. Step 6: Final answer
    x = 5,113.50

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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.