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Finding the Fourth Proportional to 129,034.40, 193,647.60 and 66,672.80

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Solution

The fourth proportional to 129,034.40, 193,647.60 and 66,672.80 is: 100,058.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,034.40 : 193,647.60 = 66,672.80 : x
  2. Step 2: Convert to fraction form
    129,034.40/193,647.60 = 66,672.80/x
  3. Step 3: Cross multiply
    129,034.40x = 193,647.60 × 66,672.80
  4. Step 4: Simplify right side
    129,034.40x = 12,911,027,705.28
  5. Step 5: Solve for x
    x = 12,911,027,705.28/129,034.40
  6. Step 6: Final answer
    x = 100,058.80

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.