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Finding the Fourth Proportional to 128,468.80, 192,616.80 and 68,507.20

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Solution

The fourth proportional to 128,468.80, 192,616.80 and 68,507.20 is: 102,714.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,468.80 : 192,616.80 = 68,507.20 : x
  2. Step 2: Convert to fraction form
    128,468.80/192,616.80 = 68,507.20/x
  3. Step 3: Cross multiply
    128,468.80x = 192,616.80 × 68,507.20
  4. Step 4: Simplify right side
    128,468.80x = 13,195,637,640.96
  5. Step 5: Solve for x
    x = 13,195,637,640.96/128,468.80
  6. Step 6: Final answer
    x = 102,714.73

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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.