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Finding the Fourth Proportional to 139,499.80, 209,249.70 and 83,512.60

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Solution

The fourth proportional to 139,499.80, 209,249.70 and 83,512.60 is: 125,268.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,499.80 : 209,249.70 = 83,512.60 : x
  2. Step 2: Convert to fraction form
    139,499.80/209,249.70 = 83,512.60/x
  3. Step 3: Cross multiply
    139,499.80x = 209,249.70 × 83,512.60
  4. Step 4: Simplify right side
    139,499.80x = 17,474,986,496.22
  5. Step 5: Solve for x
    x = 17,474,986,496.22/139,499.80
  6. Step 6: Final answer
    x = 125,268.90

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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.