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Finding the Fourth Proportional to 128,537.80, 192,720.30 and 68,576.20

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Solution

The fourth proportional to 128,537.80, 192,720.30 and 68,576.20 is: 102,818.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,537.80 : 192,720.30 = 68,576.20 : x
  2. Step 2: Convert to fraction form
    128,537.80/192,720.30 = 68,576.20/x
  3. Step 3: Cross multiply
    128,537.80x = 192,720.30 × 68,576.20
  4. Step 4: Simplify right side
    128,537.80x = 13,216,025,836.86
  5. Step 5: Solve for x
    x = 13,216,025,836.86/128,537.80
  6. Step 6: Final answer
    x = 102,818.20

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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.