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Finding the Fourth Proportional to 428,734.80, 642,907.80 and 162,406.80

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Solution

The fourth proportional to 428,734.80, 642,907.80 and 162,406.80 is: 243,536.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,734.80 : 642,907.80 = 162,406.80 : x
  2. Step 2: Convert to fraction form
    428,734.80/642,907.80 = 162,406.80/x
  3. Step 3: Cross multiply
    428,734.80x = 642,907.80 × 162,406.80
  4. Step 4: Simplify right side
    428,734.80x = 104,412,598,493.04
  5. Step 5: Solve for x
    x = 104,412,598,493.04/428,734.80
  6. Step 6: Final answer
    x = 243,536.56

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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.