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Finding the Fourth Proportional to 144,726.88, 199,721.92 and 81,065.28

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Solution

The fourth proportional to 144,726.88, 199,721.92 and 81,065.28 is: 111,869.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    144,726.88 : 199,721.92 = 81,065.28 : x
  2. Step 2: Convert to fraction form
    144,726.88/199,721.92 = 81,065.28/x
  3. Step 3: Cross multiply
    144,726.88x = 199,721.92 × 81,065.28
  4. Step 4: Simplify right side
    144,726.88x = 16,190,513,366.94
  5. Step 5: Solve for x
    x = 16,190,513,366.94/144,726.88
  6. Step 6: Final answer
    x = 111,869.43

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.