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Finding the Fourth Proportional to 102,938.80, 154,105.80 and 76,759.60

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Solution

The fourth proportional to 102,938.80, 154,105.80 and 76,759.60 is: 114,913.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    102,938.80 : 154,105.80 = 76,759.60 : x
  2. Step 2: Convert to fraction form
    102,938.80/154,105.80 = 76,759.60/x
  3. Step 3: Cross multiply
    102,938.80x = 154,105.80 × 76,759.60
  4. Step 4: Simplify right side
    102,938.80x = 11,829,099,565.68
  5. Step 5: Solve for x
    x = 11,829,099,565.68/102,938.80
  6. Step 6: Final answer
    x = 114,913.91

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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.