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Finding the Fourth Proportional to 13,366.92, 18,439.20 and 8,643

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Solution

The fourth proportional to 13,366.92, 18,439.20 and 8,643 is: 11,922.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,366.92 : 18,439.20 = 8,643 : x
  2. Step 2: Convert to fraction form
    13,366.92/18,439.20 = 8,643/x
  3. Step 3: Cross multiply
    13,366.92x = 18,439.20 × 8,643
  4. Step 4: Simplify right side
    13,366.92x = 159,370,005.60
  5. Step 5: Solve for x
    x = 159,370,005.60/13,366.92
  6. Step 6: Final answer
    x = 11,922.72

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.