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Finding the Fourth Proportional to 139,678.85, 192,753.11 and 76,015.28

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Solution

The fourth proportional to 139,678.85, 192,753.11 and 76,015.28 is: 104,899.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,678.85 : 192,753.11 = 76,015.28 : x
  2. Step 2: Convert to fraction form
    139,678.85/192,753.11 = 76,015.28/x
  3. Step 3: Cross multiply
    139,678.85x = 192,753.11 × 76,015.28
  4. Step 4: Simplify right side
    139,678.85x = 14,652,181,627.52
  5. Step 5: Solve for x
    x = 14,652,181,627.52/139,678.85
  6. Step 6: Final answer
    x = 104,899.07

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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.