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Finding the Fourth Proportional to 20,645.81, 28,503 and 13,592.73

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Solution

The fourth proportional to 20,645.81, 28,503 and 13,592.73 is: 18,765.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,645.81 : 28,503 = 13,592.73 : x
  2. Step 2: Convert to fraction form
    20,645.81/28,503 = 13,592.73/x
  3. Step 3: Cross multiply
    20,645.81x = 28,503 × 13,592.73
  4. Step 4: Simplify right side
    20,645.81x = 387,433,583.19
  5. Step 5: Solve for x
    x = 387,433,583.19/20,645.81
  6. Step 6: Final answer
    x = 18,765.73

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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.