Home / 428,342.40-642,518.64-203,724.48

Finding the Fourth Proportional to 428,342.40, 642,518.64 and 203,724.48

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Solution

The fourth proportional to 428,342.40, 642,518.64 and 203,724.48 is: 305,589.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,342.40 : 642,518.64 = 203,724.48 : x
  2. Step 2: Convert to fraction form
    428,342.40/642,518.64 = 203,724.48/x
  3. Step 3: Cross multiply
    428,342.40x = 642,518.64 × 203,724.48
  4. Step 4: Simplify right side
    428,342.40x = 130,896,775,824.31
  5. Step 5: Solve for x
    x = 130,896,775,824.31/428,342.40
  6. Step 6: Final answer
    x = 305,589.12

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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.