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Finding the Fourth Proportional to 128,459.72, 192,760.09 and 65,285.29

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Solution

The fourth proportional to 128,459.72, 192,760.09 and 65,285.29 is: 97,963.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,459.72 : 192,760.09 = 65,285.29 : x
  2. Step 2: Convert to fraction form
    128,459.72/192,760.09 = 65,285.29/x
  3. Step 3: Cross multiply
    128,459.72x = 192,760.09 × 65,285.29
  4. Step 4: Simplify right side
    128,459.72x = 12,584,397,412.28
  5. Step 5: Solve for x
    x = 12,584,397,412.28/128,459.72
  6. Step 6: Final answer
    x = 97,963.77

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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.