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Finding the Fourth Proportional to 202,139.35, 278,917.49 and 129,605.67

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Solution

The fourth proportional to 202,139.35, 278,917.49 and 129,605.67 is: 178,833.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    202,139.35 : 278,917.49 = 129,605.67 : x
  2. Step 2: Convert to fraction form
    202,139.35/278,917.49 = 129,605.67/x
  3. Step 3: Cross multiply
    202,139.35x = 278,917.49 × 129,605.67
  4. Step 4: Simplify right side
    202,139.35x = 36,149,288,490.18
  5. Step 5: Solve for x
    x = 36,149,288,490.18/202,139.35
  6. Step 6: Final answer
    x = 178,833.51

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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.