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Finding the Fourth Proportional to 129,676.85, 178,954.83 and 72,319.79

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Solution

The fourth proportional to 129,676.85, 178,954.83 and 72,319.79 is: 99,801.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,676.85 : 178,954.83 = 72,319.79 : x
  2. Step 2: Convert to fraction form
    129,676.85/178,954.83 = 72,319.79/x
  3. Step 3: Cross multiply
    129,676.85x = 178,954.83 × 72,319.79
  4. Step 4: Simplify right side
    129,676.85x = 12,941,976,172.47
  5. Step 5: Solve for x
    x = 12,941,976,172.47/129,676.85
  6. Step 6: Final answer
    x = 99,801.75

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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.