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Finding the Fourth Proportional to 103,612.51, 155,418.77 and 68,543.97

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Solution

The fourth proportional to 103,612.51, 155,418.77 and 68,543.97 is: 102,815.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,612.51 : 155,418.77 = 68,543.97 : x
  2. Step 2: Convert to fraction form
    103,612.51/155,418.77 = 68,543.97/x
  3. Step 3: Cross multiply
    103,612.51x = 155,418.77 × 68,543.97
  4. Step 4: Simplify right side
    103,612.51x = 10,653,019,508.32
  5. Step 5: Solve for x
    x = 10,653,019,508.32/103,612.51
  6. Step 6: Final answer
    x = 102,815.96

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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.