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Finding the Fourth Proportional to 138,452.75, 191,128.58 and 81,084.09

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Solution

The fourth proportional to 138,452.75, 191,128.58 and 81,084.09 is: 111,933.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,452.75 : 191,128.58 = 81,084.09 : x
  2. Step 2: Convert to fraction form
    138,452.75/191,128.58 = 81,084.09/x
  3. Step 3: Cross multiply
    138,452.75x = 191,128.58 × 81,084.09
  4. Step 4: Simplify right side
    138,452.75x = 15,497,486,982.29
  5. Step 5: Solve for x
    x = 15,497,486,982.29/138,452.75
  6. Step 6: Final answer
    x = 111,933.40

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1.5x scale

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.