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Finding the Fourth Proportional to 139,071.48, 191,919.90 and 75,409.44

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Solution

The fourth proportional to 139,071.48, 191,919.90 and 75,409.44 is: 104,065.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,071.48 : 191,919.90 = 75,409.44 : x
  2. Step 2: Convert to fraction form
    139,071.48/191,919.90 = 75,409.44/x
  3. Step 3: Cross multiply
    139,071.48x = 191,919.90 × 75,409.44
  4. Step 4: Simplify right side
    139,071.48x = 14,472,572,183.86
  5. Step 5: Solve for x
    x = 14,472,572,183.86/139,071.48
  6. Step 6: Final answer
    x = 104,065.71

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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.