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Finding the Fourth Proportional to 139,453.80, 209,399.40 and 80,404.80

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Solution

The fourth proportional to 139,453.80, 209,399.40 and 80,404.80 is: 120,733.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,453.80 : 209,399.40 = 80,404.80 : x
  2. Step 2: Convert to fraction form
    139,453.80/209,399.40 = 80,404.80/x
  3. Step 3: Cross multiply
    139,453.80x = 209,399.40 × 80,404.80
  4. Step 4: Simplify right side
    139,453.80x = 16,836,716,877.12
  5. Step 5: Solve for x
    x = 16,836,716,877.12/139,453.80
  6. Step 6: Final answer
    x = 120,733.30

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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.