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Finding the Fourth Proportional to 13,989.64, 20,991.76 and 5,675.80

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Solution

The fourth proportional to 13,989.64, 20,991.76 and 5,675.80 is: 8,516.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,989.64 : 20,991.76 = 5,675.80 : x
  2. Step 2: Convert to fraction form
    13,989.64/20,991.76 = 5,675.80/x
  3. Step 3: Cross multiply
    13,989.64x = 20,991.76 × 5,675.80
  4. Step 4: Simplify right side
    13,989.64x = 119,145,031.41
  5. Step 5: Solve for x
    x = 119,145,031.41/13,989.64
  6. Step 6: Final answer
    x = 8,516.66

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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.