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Finding the Fourth Proportional to 13,638.61, 18,814.92 and 8,858.21

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Solution

The fourth proportional to 13,638.61, 18,814.92 and 8,858.21 is: 12,220.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,638.61 : 18,814.92 = 8,858.21 : x
  2. Step 2: Convert to fraction form
    13,638.61/18,814.92 = 8,858.21/x
  3. Step 3: Cross multiply
    13,638.61x = 18,814.92 × 8,858.21
  4. Step 4: Simplify right side
    13,638.61x = 166,666,512.49
  5. Step 5: Solve for x
    x = 166,666,512.49/13,638.61
  6. Step 6: Final answer
    x = 12,220.20

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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.