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Finding the Fourth Proportional to 103,436.80, 155,155.20 and 92,939.20

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Solution

The fourth proportional to 103,436.80, 155,155.20 and 92,939.20 is: 139,408.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,436.80 : 155,155.20 = 92,939.20 : x
  2. Step 2: Convert to fraction form
    103,436.80/155,155.20 = 92,939.20/x
  3. Step 3: Cross multiply
    103,436.80x = 155,155.20 × 92,939.20
  4. Step 4: Simplify right side
    103,436.80x = 14,420,000,163.84
  5. Step 5: Solve for x
    x = 14,420,000,163.84/103,436.80
  6. Step 6: Final answer
    x = 139,408.80

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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.