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Finding the Fourth Proportional to 126,643.20, 189,964.80 and 125,768.40

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Solution

The fourth proportional to 126,643.20, 189,964.80 and 125,768.40 is: 188,652.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    126,643.20 : 189,964.80 = 125,768.40 : x
  2. Step 2: Convert to fraction form
    126,643.20/189,964.80 = 125,768.40/x
  3. Step 3: Cross multiply
    126,643.20x = 189,964.80 × 125,768.40
  4. Step 4: Simplify right side
    126,643.20x = 23,891,568,952.32
  5. Step 5: Solve for x
    x = 23,891,568,952.32/126,643.20
  6. Step 6: Final answer
    x = 188,652.60

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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.