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Finding the Fourth Proportional to 103,638.93, 155,458.38 and 28,759.08

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Solution

The fourth proportional to 103,638.93, 155,458.38 and 28,759.08 is: 43,138.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,638.93 : 155,458.38 = 28,759.08 : x
  2. Step 2: Convert to fraction form
    103,638.93/155,458.38 = 28,759.08/x
  3. Step 3: Cross multiply
    103,638.93x = 155,458.38 × 28,759.08
  4. Step 4: Simplify right side
    103,638.93x = 4,470,839,987.09
  5. Step 5: Solve for x
    x = 4,470,839,987.09/103,638.93
  6. Step 6: Final answer
    x = 43,138.62

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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.