Home / 428,786.32-643,119.90-300,313.48

Finding the Fourth Proportional to 428,786.32, 643,119.90 and 300,313.48

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Solution

The fourth proportional to 428,786.32, 643,119.90 and 300,313.48 is: 450,428.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,786.32 : 643,119.90 = 300,313.48 : x
  2. Step 2: Convert to fraction form
    428,786.32/643,119.90 = 300,313.48/x
  3. Step 3: Cross multiply
    428,786.32x = 643,119.90 × 300,313.48
  4. Step 4: Simplify right side
    428,786.32x = 193,137,575,226.25
  5. Step 5: Solve for x
    x = 193,137,575,226.25/428,786.32
  6. Step 6: Final answer
    x = 450,428.49

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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.