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Finding the Fourth Proportional to 72,418.51, 99,936.03 and 39,712.46

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Solution

The fourth proportional to 72,418.51, 99,936.03 and 39,712.46 is: 54,802.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,418.51 : 99,936.03 = 39,712.46 : x
  2. Step 2: Convert to fraction form
    72,418.51/99,936.03 = 39,712.46/x
  3. Step 3: Cross multiply
    72,418.51x = 99,936.03 × 39,712.46
  4. Step 4: Simplify right side
    72,418.51x = 3,968,705,843.77
  5. Step 5: Solve for x
    x = 3,968,705,843.77/72,418.51
  6. Step 6: Final answer
    x = 54,802.37

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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.