Home / 428,072.36-642,114.86-203,455.72

Finding the Fourth Proportional to 428,072.36, 642,114.86 and 203,455.72

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Solution

The fourth proportional to 428,072.36, 642,114.86 and 203,455.72 is: 305,186.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,072.36 : 642,114.86 = 203,455.72 : x
  2. Step 2: Convert to fraction form
    428,072.36/642,114.86 = 203,455.72/x
  3. Step 3: Cross multiply
    428,072.36x = 642,114.86 × 203,455.72
  4. Step 4: Simplify right side
    428,072.36x = 130,641,941,164.00
  5. Step 5: Solve for x
    x = 130,641,941,164.00/428,072.36
  6. Step 6: Final answer
    x = 305,186.58

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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.