Home / 428,301.28-643,378.96-278,464.48

Finding the Fourth Proportional to 428,301.28, 643,378.96 and 278,464.48

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Solution

The fourth proportional to 428,301.28, 643,378.96 and 278,464.48 is: 418,299.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,301.28 : 643,378.96 = 278,464.48 : x
  2. Step 2: Convert to fraction form
    428,301.28/643,378.96 = 278,464.48/x
  3. Step 3: Cross multiply
    428,301.28x = 643,378.96 × 278,464.48
  4. Step 4: Simplify right side
    428,301.28x = 179,158,187,539.34
  5. Step 5: Solve for x
    x = 179,158,187,539.34/428,301.28
  6. Step 6: Final answer
    x = 418,299.44

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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.