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Finding the Fourth Proportional to 428,725.80, 642,725.82 and 162,339.48

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Solution

The fourth proportional to 428,725.80, 642,725.82 and 162,339.48 is: 243,371.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,725.80 : 642,725.82 = 162,339.48 : x
  2. Step 2: Convert to fraction form
    428,725.80/642,725.82 = 162,339.48/x
  3. Step 3: Cross multiply
    428,725.80x = 642,725.82 × 162,339.48
  4. Step 4: Simplify right side
    428,725.80x = 104,339,775,401.37
  5. Step 5: Solve for x
    x = 104,339,775,401.37/428,725.80
  6. Step 6: Final answer
    x = 243,371.81

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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.