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Finding the Fourth Proportional to 103,689.60, 155,145.60 and 68,697.60

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Solution

The fourth proportional to 103,689.60, 155,145.60 and 68,697.60 is: 102,788.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,689.60 : 155,145.60 = 68,697.60 : x
  2. Step 2: Convert to fraction form
    103,689.60/155,145.60 = 68,697.60/x
  3. Step 3: Cross multiply
    103,689.60x = 155,145.60 × 68,697.60
  4. Step 4: Simplify right side
    103,689.60x = 10,658,130,370.56
  5. Step 5: Solve for x
    x = 10,658,130,370.56/103,689.60
  6. Step 6: Final answer
    x = 102,788.81

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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.