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Finding the Fourth Proportional to 13,235.80, 19,869.90 and 13,138.60

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Solution

The fourth proportional to 13,235.80, 19,869.90 and 13,138.60 is: 19,723.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,235.80 : 19,869.90 = 13,138.60 : x
  2. Step 2: Convert to fraction form
    13,235.80/19,869.90 = 13,138.60/x
  3. Step 3: Cross multiply
    13,235.80x = 19,869.90 × 13,138.60
  4. Step 4: Simplify right side
    13,235.80x = 261,062,668.14
  5. Step 5: Solve for x
    x = 261,062,668.14/13,235.80
  6. Step 6: Final answer
    x = 19,723.98

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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.