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Finding the Fourth Proportional to 103,038.80, 154,255.80 and 76,859.60

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Solution

The fourth proportional to 103,038.80, 154,255.80 and 76,859.60 is: 115,063.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,038.80 : 154,255.80 = 76,859.60 : x
  2. Step 2: Convert to fraction form
    103,038.80/154,255.80 = 76,859.60/x
  3. Step 3: Cross multiply
    103,038.80x = 154,255.80 × 76,859.60
  4. Step 4: Simplify right side
    103,038.80x = 11,856,039,085.68
  5. Step 5: Solve for x
    x = 11,856,039,085.68/103,038.80
  6. Step 6: Final answer
    x = 115,063.83

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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.