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Finding the Fourth Proportional to 128,502.36, 192,974.14 and 78,873.88

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Solution

The fourth proportional to 128,502.36, 192,974.14 and 78,873.88 is: 118,446.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,502.36 : 192,974.14 = 78,873.88 : x
  2. Step 2: Convert to fraction form
    128,502.36/192,974.14 = 78,873.88/x
  3. Step 3: Cross multiply
    128,502.36x = 192,974.14 × 78,873.88
  4. Step 4: Simplify right side
    128,502.36x = 15,220,619,161.46
  5. Step 5: Solve for x
    x = 15,220,619,161.46/128,502.36
  6. Step 6: Final answer
    x = 118,446.22

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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.