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Finding the Fourth Proportional to 128,520.26, 192,789.40 and 39,762.08

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Solution

The fourth proportional to 128,520.26, 192,789.40 and 39,762.08 is: 59,645.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,520.26 : 192,789.40 = 39,762.08 : x
  2. Step 2: Convert to fraction form
    128,520.26/192,789.40 = 39,762.08/x
  3. Step 3: Cross multiply
    128,520.26x = 192,789.40 × 39,762.08
  4. Step 4: Simplify right side
    128,520.26x = 7,665,707,545.95
  5. Step 5: Solve for x
    x = 7,665,707,545.95/128,520.26
  6. Step 6: Final answer
    x = 59,645.91

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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.