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Finding the Fourth Proportional to 128,500.80, 192,664.80 and 68,539.20

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Solution

The fourth proportional to 128,500.80, 192,664.80 and 68,539.20 is: 102,762.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,500.80 : 192,664.80 = 68,539.20 : x
  2. Step 2: Convert to fraction form
    128,500.80/192,664.80 = 68,539.20/x
  3. Step 3: Cross multiply
    128,500.80x = 192,664.80 × 68,539.20
  4. Step 4: Simplify right side
    128,500.80x = 13,205,091,260.16
  5. Step 5: Solve for x
    x = 13,205,091,260.16/128,500.80
  6. Step 6: Final answer
    x = 102,762.72

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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.