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Finding the Fourth Proportional to 20,688.89, 28,546.89 and 13,516.90

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Solution

The fourth proportional to 20,688.89, 28,546.89 and 13,516.90 is: 18,650.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,688.89 : 28,546.89 = 13,516.90 : x
  2. Step 2: Convert to fraction form
    20,688.89/28,546.89 = 13,516.90/x
  3. Step 3: Cross multiply
    20,688.89x = 28,546.89 × 13,516.90
  4. Step 4: Simplify right side
    20,688.89x = 385,865,247.12
  5. Step 5: Solve for x
    x = 385,865,247.12/20,688.89
  6. Step 6: Final answer
    x = 18,650.85

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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.