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Finding the Fourth Proportional to 13,643.79, 18,828.02 and 8,269.41

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Solution

The fourth proportional to 13,643.79, 18,828.02 and 8,269.41 is: 11,411.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,643.79 : 18,828.02 = 8,269.41 : x
  2. Step 2: Convert to fraction form
    13,643.79/18,828.02 = 8,269.41/x
  3. Step 3: Cross multiply
    13,643.79x = 18,828.02 × 8,269.41
  4. Step 4: Simplify right side
    13,643.79x = 155,696,590.47
  5. Step 5: Solve for x
    x = 155,696,590.47/13,643.79
  6. Step 6: Final answer
    x = 11,411.54

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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.