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Finding the Fourth Proportional to 128,472.46, 192,698.97 and 39,726.52

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Solution

The fourth proportional to 128,472.46, 192,698.97 and 39,726.52 is: 59,586.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,472.46 : 192,698.97 = 39,726.52 : x
  2. Step 2: Convert to fraction form
    128,472.46/192,698.97 = 39,726.52/x
  3. Step 3: Cross multiply
    128,472.46x = 192,698.97 × 39,726.52
  4. Step 4: Simplify right side
    128,472.46x = 7,655,259,485.68
  5. Step 5: Solve for x
    x = 7,655,259,485.68/128,472.46
  6. Step 6: Final answer
    x = 59,586.77

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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.