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Finding the Fourth Proportional to 13,638.98, 18,817.71 and 8,328.22

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Solution

The fourth proportional to 13,638.98, 18,817.71 and 8,328.22 is: 11,490.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,638.98 : 18,817.71 = 8,328.22 : x
  2. Step 2: Convert to fraction form
    13,638.98/18,817.71 = 8,328.22/x
  3. Step 3: Cross multiply
    13,638.98x = 18,817.71 × 8,328.22
  4. Step 4: Simplify right side
    13,638.98x = 156,718,028.78
  5. Step 5: Solve for x
    x = 156,718,028.78/13,638.98
  6. Step 6: Final answer
    x = 11,490.45

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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.