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Finding the Fourth Proportional to 13,999.88, 20,999.66 and 5,677.92

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Solution

The fourth proportional to 13,999.88, 20,999.66 and 5,677.92 is: 8,516.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,999.88 : 20,999.66 = 5,677.92 : x
  2. Step 2: Convert to fraction form
    13,999.88/20,999.66 = 5,677.92/x
  3. Step 3: Cross multiply
    13,999.88x = 20,999.66 × 5,677.92
  4. Step 4: Simplify right side
    13,999.88x = 119,234,389.51
  5. Step 5: Solve for x
    x = 119,234,389.51/13,999.88
  6. Step 6: Final answer
    x = 8,516.82

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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.