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Finding the Fourth Proportional to 428,065.39, 642,104.36 and 203,448.74

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Solution

The fourth proportional to 428,065.39, 642,104.36 and 203,448.74 is: 305,176.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,065.39 : 642,104.36 = 203,448.74 : x
  2. Step 2: Convert to fraction form
    428,065.39/642,104.36 = 203,448.74/x
  3. Step 3: Cross multiply
    428,065.39x = 642,104.36 × 203,448.74
  4. Step 4: Simplify right side
    428,065.39x = 130,635,321,973.26
  5. Step 5: Solve for x
    x = 130,635,321,973.26/428,065.39
  6. Step 6: Final answer
    x = 305,176.09

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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.