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Finding the Fourth Proportional to 103,638.35, 155,687.93 and 100,873.55

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Solution

The fourth proportional to 103,638.35, 155,687.93 and 100,873.55 is: 151,534.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,638.35 : 155,687.93 = 100,873.55 : x
  2. Step 2: Convert to fraction form
    103,638.35/155,687.93 = 100,873.55/x
  3. Step 3: Cross multiply
    103,638.35x = 155,687.93 × 100,873.55
  4. Step 4: Simplify right side
    103,638.35x = 15,704,794,191.25
  5. Step 5: Solve for x
    x = 15,704,794,191.25/103,638.35
  6. Step 6: Final answer
    x = 151,534.58

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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.