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Finding the Fourth Proportional to 103,765.61, 155,648.45 and 80,107.70

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Solution

The fourth proportional to 103,765.61, 155,648.45 and 80,107.70 is: 120,161.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,765.61 : 155,648.45 = 80,107.70 : x
  2. Step 2: Convert to fraction form
    103,765.61/155,648.45 = 80,107.70/x
  3. Step 3: Cross multiply
    103,765.61x = 155,648.45 × 80,107.70
  4. Step 4: Simplify right side
    103,765.61x = 12,468,638,517.90
  5. Step 5: Solve for x
    x = 12,468,638,517.90/103,765.61
  6. Step 6: Final answer
    x = 120,161.57

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1.5x scale

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.