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Finding the Fourth Proportional to 128,536.80, 192,718.80 and 68,575.20

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Solution

The fourth proportional to 128,536.80, 192,718.80 and 68,575.20 is: 102,816.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,536.80 : 192,718.80 = 68,575.20 : x
  2. Step 2: Convert to fraction form
    128,536.80/192,718.80 = 68,575.20/x
  3. Step 3: Cross multiply
    128,536.80x = 192,718.80 × 68,575.20
  4. Step 4: Simplify right side
    128,536.80x = 13,215,730,253.76
  5. Step 5: Solve for x
    x = 13,215,730,253.76/128,536.80
  6. Step 6: Final answer
    x = 102,816.71

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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.