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Finding the Fourth Proportional to 320,003.20, 479,620.80 and 132,918.40

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Solution

The fourth proportional to 320,003.20, 479,620.80 and 132,918.40 is: 199,218.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    320,003.20 : 479,620.80 = 132,918.40 : x
  2. Step 2: Convert to fraction form
    320,003.20/479,620.80 = 132,918.40/x
  3. Step 3: Cross multiply
    320,003.20x = 479,620.80 × 132,918.40
  4. Step 4: Simplify right side
    320,003.20x = 63,750,429,342.72
  5. Step 5: Solve for x
    x = 63,750,429,342.72/320,003.20
  6. Step 6: Final answer
    x = 199,218.10

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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.