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Finding the Fourth Proportional to 219,672.74, 303,138.76 and 129,038

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Solution

The fourth proportional to 219,672.74, 303,138.76 and 129,038 is: 178,066.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    219,672.74 : 303,138.76 = 129,038 : x
  2. Step 2: Convert to fraction form
    219,672.74/303,138.76 = 129,038/x
  3. Step 3: Cross multiply
    219,672.74x = 303,138.76 × 129,038
  4. Step 4: Simplify right side
    219,672.74x = 39,116,419,312.88
  5. Step 5: Solve for x
    x = 39,116,419,312.88/219,672.74
  6. Step 6: Final answer
    x = 178,066.79

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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.