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Finding the Fourth Proportional to 129,635.05, 178,978.94 and 105,818.35

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Solution

The fourth proportional to 129,635.05, 178,978.94 and 105,818.35 is: 146,096.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,635.05 : 178,978.94 = 105,818.35 : x
  2. Step 2: Convert to fraction form
    129,635.05/178,978.94 = 105,818.35/x
  3. Step 3: Cross multiply
    129,635.05x = 178,978.94 × 105,818.35
  4. Step 4: Simplify right side
    129,635.05x = 18,939,256,115.55
  5. Step 5: Solve for x
    x = 18,939,256,115.55/129,635.05
  6. Step 6: Final answer
    x = 146,096.72

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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.