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Finding the Fourth Proportional to 139,993.80, 210,209.40 and 80,944.80

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Solution

The fourth proportional to 139,993.80, 210,209.40 and 80,944.80 is: 121,543.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,993.80 : 210,209.40 = 80,944.80 : x
  2. Step 2: Convert to fraction form
    139,993.80/210,209.40 = 80,944.80/x
  3. Step 3: Cross multiply
    139,993.80x = 210,209.40 × 80,944.80
  4. Step 4: Simplify right side
    139,993.80x = 17,015,357,841.12
  5. Step 5: Solve for x
    x = 17,015,357,841.12/139,993.80
  6. Step 6: Final answer
    x = 121,543.65

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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.