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Finding the Fourth Proportional to 128,416.32, 192,363.36 and 104,808

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Solution

The fourth proportional to 128,416.32, 192,363.36 and 104,808 is: 156,998.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,416.32 : 192,363.36 = 104,808 : x
  2. Step 2: Convert to fraction form
    128,416.32/192,363.36 = 104,808/x
  3. Step 3: Cross multiply
    128,416.32x = 192,363.36 × 104,808
  4. Step 4: Simplify right side
    128,416.32x = 20,161,219,034.88
  5. Step 5: Solve for x
    x = 20,161,219,034.88/128,416.32
  6. Step 6: Final answer
    x = 156,998.88

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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.