Home / 428,936.31-643,601.30-218,721.87

Finding the Fourth Proportional to 428,936.31, 643,601.30 and 218,721.87

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Solution

The fourth proportional to 428,936.31, 643,601.30 and 218,721.87 is: 328,183.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,936.31 : 643,601.30 = 218,721.87 : x
  2. Step 2: Convert to fraction form
    428,936.31/643,601.30 = 218,721.87/x
  3. Step 3: Cross multiply
    428,936.31x = 643,601.30 × 218,721.87
  4. Step 4: Simplify right side
    428,936.31x = 140,769,678,776.82
  5. Step 5: Solve for x
    x = 140,769,678,776.82/428,936.31
  6. Step 6: Final answer
    x = 328,183.17

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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.