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Finding the Fourth Proportional to 13,999.90, 20,999.85 and 8,086.90

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Solution

The fourth proportional to 13,999.90, 20,999.85 and 8,086.90 is: 12,130.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,999.90 : 20,999.85 = 8,086.90 : x
  2. Step 2: Convert to fraction form
    13,999.90/20,999.85 = 8,086.90/x
  3. Step 3: Cross multiply
    13,999.90x = 20,999.85 × 8,086.90
  4. Step 4: Simplify right side
    13,999.90x = 169,823,686.97
  5. Step 5: Solve for x
    x = 169,823,686.97/13,999.90
  6. Step 6: Final answer
    x = 12,130.35

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.