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Finding the Fourth Proportional to 428,400.80, 642,406.80 and 162,072.80

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Solution

The fourth proportional to 428,400.80, 642,406.80 and 162,072.80 is: 243,035.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,400.80 : 642,406.80 = 162,072.80 : x
  2. Step 2: Convert to fraction form
    428,400.80/642,406.80 = 162,072.80/x
  3. Step 3: Cross multiply
    428,400.80x = 642,406.80 × 162,072.80
  4. Step 4: Simplify right side
    428,400.80x = 104,116,668,815.04
  5. Step 5: Solve for x
    x = 104,116,668,815.04/428,400.80
  6. Step 6: Final answer
    x = 243,035.65

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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.