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Finding the Fourth Proportional to 219,187.20, 328,780.80 and 71,443.20

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Solution

The fourth proportional to 219,187.20, 328,780.80 and 71,443.20 is: 107,164.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    219,187.20 : 328,780.80 = 71,443.20 : x
  2. Step 2: Convert to fraction form
    219,187.20/328,780.80 = 71,443.20/x
  3. Step 3: Cross multiply
    219,187.20x = 328,780.80 × 71,443.20
  4. Step 4: Simplify right side
    219,187.20x = 23,489,152,450.56
  5. Step 5: Solve for x
    x = 23,489,152,450.56/219,187.20
  6. Step 6: Final answer
    x = 107,164.80

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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.