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Finding the Fourth Proportional to 133,438.80, 200,465.40 and 128,216.40

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Solution

The fourth proportional to 133,438.80, 200,465.40 and 128,216.40 is: 192,619.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    133,438.80 : 200,465.40 = 128,216.40 : x
  2. Step 2: Convert to fraction form
    133,438.80/200,465.40 = 128,216.40/x
  3. Step 3: Cross multiply
    133,438.80x = 200,465.40 × 128,216.40
  4. Step 4: Simplify right side
    133,438.80x = 25,702,951,912.56
  5. Step 5: Solve for x
    x = 25,702,951,912.56/133,438.80
  6. Step 6: Final answer
    x = 192,619.78

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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.