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Finding the Fourth Proportional to 129,423.94, 178,638.31 and 100,736.98

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Solution

The fourth proportional to 129,423.94, 178,638.31 and 100,736.98 is: 139,042.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,423.94 : 178,638.31 = 100,736.98 : x
  2. Step 2: Convert to fraction form
    129,423.94/178,638.31 = 100,736.98/x
  3. Step 3: Cross multiply
    129,423.94x = 178,638.31 × 100,736.98
  4. Step 4: Simplify right side
    129,423.94x = 17,995,483,861.70
  5. Step 5: Solve for x
    x = 17,995,483,861.70/129,423.94
  6. Step 6: Final answer
    x = 139,042.93

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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.