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Finding the Fourth Proportional to 129,375.72, 178,541.30 and 72,018

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Solution

The fourth proportional to 129,375.72, 178,541.30 and 72,018 is: 99,386.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,375.72 : 178,541.30 = 72,018 : x
  2. Step 2: Convert to fraction form
    129,375.72/178,541.30 = 72,018/x
  3. Step 3: Cross multiply
    129,375.72x = 178,541.30 × 72,018
  4. Step 4: Simplify right side
    129,375.72x = 12,858,187,343.40
  5. Step 5: Solve for x
    x = 12,858,187,343.40/129,375.72
  6. Step 6: Final answer
    x = 99,386.40

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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.