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Finding the Fourth Proportional to 103,620.85, 155,431.28 and 91,956.85

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Solution

The fourth proportional to 103,620.85, 155,431.28 and 91,956.85 is: 137,935.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,620.85 : 155,431.28 = 91,956.85 : x
  2. Step 2: Convert to fraction form
    103,620.85/155,431.28 = 91,956.85/x
  3. Step 3: Cross multiply
    103,620.85x = 155,431.28 × 91,956.85
  4. Step 4: Simplify right side
    103,620.85x = 14,292,970,900.27
  5. Step 5: Solve for x
    x = 14,292,970,900.27/103,620.85
  6. Step 6: Final answer
    x = 137,935.28

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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.