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Finding the Fourth Proportional to 139,242.20, 192,155.20 and 75,579.98

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Solution

The fourth proportional to 139,242.20, 192,155.20 and 75,579.98 is: 104,300.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,242.20 : 192,155.20 = 75,579.98 : x
  2. Step 2: Convert to fraction form
    139,242.20/192,155.20 = 75,579.98/x
  3. Step 3: Cross multiply
    139,242.20x = 192,155.20 × 75,579.98
  4. Step 4: Simplify right side
    139,242.20x = 14,523,086,172.90
  5. Step 5: Solve for x
    x = 14,523,086,172.90/139,242.20
  6. Step 6: Final answer
    x = 104,300.90

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.