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Finding the Fourth Proportional to 91,890, 126,808.32 and 52,146

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Solution

The fourth proportional to 91,890, 126,808.32 and 52,146 is: 71,961.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,890 : 126,808.32 = 52,146 : x
  2. Step 2: Convert to fraction form
    91,890/126,808.32 = 52,146/x
  3. Step 3: Cross multiply
    91,890x = 126,808.32 × 52,146
  4. Step 4: Simplify right side
    91,890x = 6,612,546,654.72
  5. Step 5: Solve for x
    x = 6,612,546,654.72/91,890
  6. Step 6: Final answer
    x = 71,961.55

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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.