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Finding the Fourth Proportional to 128,649.18, 192,919.09 and 52,695.36

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Solution

The fourth proportional to 128,649.18, 192,919.09 and 52,695.36 is: 79,020.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,649.18 : 192,919.09 = 52,695.36 : x
  2. Step 2: Convert to fraction form
    128,649.18/192,919.09 = 52,695.36/x
  3. Step 3: Cross multiply
    128,649.18x = 192,919.09 × 52,695.36
  4. Step 4: Simplify right side
    128,649.18x = 10,165,940,898.42
  5. Step 5: Solve for x
    x = 10,165,940,898.42/128,649.18
  6. Step 6: Final answer
    x = 79,020.64

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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.