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Finding the Fourth Proportional to 13,640.62, 20,339.03 and 13,613.98

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Solution

The fourth proportional to 13,640.62, 20,339.03 and 13,613.98 is: 20,299.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,640.62 : 20,339.03 = 13,613.98 : x
  2. Step 2: Convert to fraction form
    13,640.62/20,339.03 = 13,613.98/x
  3. Step 3: Cross multiply
    13,640.62x = 20,339.03 × 13,613.98
  4. Step 4: Simplify right side
    13,640.62x = 276,895,147.64
  5. Step 5: Solve for x
    x = 276,895,147.64/13,640.62
  6. Step 6: Final answer
    x = 20,299.31

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.