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Finding the Fourth Proportional to 128,565.36, 192,853.71 and 39,820.68

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Solution

The fourth proportional to 128,565.36, 192,853.71 and 39,820.68 is: 59,732.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,565.36 : 192,853.71 = 39,820.68 : x
  2. Step 2: Convert to fraction form
    128,565.36/192,853.71 = 39,820.68/x
  3. Step 3: Cross multiply
    128,565.36x = 192,853.71 × 39,820.68
  4. Step 4: Simplify right side
    128,565.36x = 7,679,565,872.72
  5. Step 5: Solve for x
    x = 7,679,565,872.72/128,565.36
  6. Step 6: Final answer
    x = 59,732.78

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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.