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Finding the Fourth Proportional to 219,818.72, 329,932.20 and 86,790.80

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Solution

The fourth proportional to 219,818.72, 329,932.20 and 86,790.80 is: 130,266.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    219,818.72 : 329,932.20 = 86,790.80 : x
  2. Step 2: Convert to fraction form
    219,818.72/329,932.20 = 86,790.80/x
  3. Step 3: Cross multiply
    219,818.72x = 329,932.20 × 86,790.80
  4. Step 4: Simplify right side
    219,818.72x = 28,635,079,583.76
  5. Step 5: Solve for x
    x = 28,635,079,583.76/219,818.72
  6. Step 6: Final answer
    x = 130,266.79

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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.