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Finding the Fourth Proportional to 139,945.86, 209,879.78 and 38,719.53

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Solution

The fourth proportional to 139,945.86, 209,879.78 and 38,719.53 is: 58,068.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,945.86 : 209,879.78 = 38,719.53 : x
  2. Step 2: Convert to fraction form
    139,945.86/209,879.78 = 38,719.53/x
  3. Step 3: Cross multiply
    139,945.86x = 209,879.78 × 38,719.53
  4. Step 4: Simplify right side
    139,945.86x = 8,126,446,244.51
  5. Step 5: Solve for x
    x = 8,126,446,244.51/139,945.86
  6. Step 6: Final answer
    x = 58,068.50

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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.