Home / 428,076.90-642,121.61-203,460.26

Finding the Fourth Proportional to 428,076.90, 642,121.61 and 203,460.26

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Solution

The fourth proportional to 428,076.90, 642,121.61 and 203,460.26 is: 305,193.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,076.90 : 642,121.61 = 203,460.26 : x
  2. Step 2: Convert to fraction form
    428,076.90/642,121.61 = 203,460.26/x
  3. Step 3: Cross multiply
    428,076.90x = 642,121.61 × 203,460.26
  4. Step 4: Simplify right side
    428,076.90x = 130,646,225,494.31
  5. Step 5: Solve for x
    x = 130,646,225,494.31/428,076.90
  6. Step 6: Final answer
    x = 305,193.36

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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.