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Finding the Fourth Proportional to 278,466.21, 417,632.40 and 128,562.48

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Solution

The fourth proportional to 278,466.21, 417,632.40 and 128,562.48 is: 192,812.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    278,466.21 : 417,632.40 = 128,562.48 : x
  2. Step 2: Convert to fraction form
    278,466.21/417,632.40 = 128,562.48/x
  3. Step 3: Cross multiply
    278,466.21x = 417,632.40 × 128,562.48
  4. Step 4: Simplify right side
    278,466.21x = 53,691,857,072.35
  5. Step 5: Solve for x
    x = 53,691,857,072.35/278,466.21
  6. Step 6: Final answer
    x = 192,812.83

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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.