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Finding the Fourth Proportional to 20,438.70, 28,198.17 and 13,364.70

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Solution

The fourth proportional to 20,438.70, 28,198.17 and 13,364.70 is: 18,438.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,438.70 : 28,198.17 = 13,364.70 : x
  2. Step 2: Convert to fraction form
    20,438.70/28,198.17 = 13,364.70/x
  3. Step 3: Cross multiply
    20,438.70x = 28,198.17 × 13,364.70
  4. Step 4: Simplify right side
    20,438.70x = 376,860,082.60
  5. Step 5: Solve for x
    x = 376,860,082.60/20,438.70
  6. Step 6: Final answer
    x = 18,438.55

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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.