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Finding the Fourth Proportional to 128,508.72, 192,772.80 and 39,771.20

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Solution

The fourth proportional to 128,508.72, 192,772.80 and 39,771.20 is: 59,659.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,508.72 : 192,772.80 = 39,771.20 : x
  2. Step 2: Convert to fraction form
    128,508.72/192,772.80 = 39,771.20/x
  3. Step 3: Cross multiply
    128,508.72x = 192,772.80 × 39,771.20
  4. Step 4: Simplify right side
    128,508.72x = 7,666,805,583.36
  5. Step 5: Solve for x
    x = 7,666,805,583.36/128,508.72
  6. Step 6: Final answer
    x = 59,659.81

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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.