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Finding the Fourth Proportional to 13,755.88, 18,985.62 and 8,170.12

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Solution

The fourth proportional to 13,755.88, 18,985.62 and 8,170.12 is: 11,276.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,755.88 : 18,985.62 = 8,170.12 : x
  2. Step 2: Convert to fraction form
    13,755.88/18,985.62 = 8,170.12/x
  3. Step 3: Cross multiply
    13,755.88x = 18,985.62 × 8,170.12
  4. Step 4: Simplify right side
    13,755.88x = 155,114,793.67
  5. Step 5: Solve for x
    x = 155,114,793.67/13,755.88
  6. Step 6: Final answer
    x = 11,276.25

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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.