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Finding the Fourth Proportional to 219,939.80, 329,765.70 and 86,739.80

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Solution

The fourth proportional to 219,939.80, 329,765.70 and 86,739.80 is: 130,052.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    219,939.80 : 329,765.70 = 86,739.80 : x
  2. Step 2: Convert to fraction form
    219,939.80/329,765.70 = 86,739.80/x
  3. Step 3: Cross multiply
    219,939.80x = 329,765.70 × 86,739.80
  4. Step 4: Simplify right side
    219,939.80x = 28,603,810,864.86
  5. Step 5: Solve for x
    x = 28,603,810,864.86/219,939.80
  6. Step 6: Final answer
    x = 130,052.91

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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.