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Finding the Fourth Proportional to 91,939.60, 126,893.16 and 54,211.60

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Solution

The fourth proportional to 91,939.60, 126,893.16 and 54,211.60 is: 74,821.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,939.60 : 126,893.16 = 54,211.60 : x
  2. Step 2: Convert to fraction form
    91,939.60/126,893.16 = 54,211.60/x
  3. Step 3: Cross multiply
    91,939.60x = 126,893.16 × 54,211.60
  4. Step 4: Simplify right side
    91,939.60x = 6,879,081,232.66
  5. Step 5: Solve for x
    x = 6,879,081,232.66/91,939.60
  6. Step 6: Final answer
    x = 74,821.74

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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.