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Finding the Fourth Proportional to 219,843.20, 329,764.80 and 86,679.20

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Solution

The fourth proportional to 219,843.20, 329,764.80 and 86,679.20 is: 130,018.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    219,843.20 : 329,764.80 = 86,679.20 : x
  2. Step 2: Convert to fraction form
    219,843.20/329,764.80 = 86,679.20/x
  3. Step 3: Cross multiply
    219,843.20x = 329,764.80 × 86,679.20
  4. Step 4: Simplify right side
    219,843.20x = 28,583,749,052.16
  5. Step 5: Solve for x
    x = 28,583,749,052.16/219,843.20
  6. Step 6: Final answer
    x = 130,018.80

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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.