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Finding the Fourth Proportional to 138,706.79, 191,354.33 and 81,316.94

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Solution

The fourth proportional to 138,706.79, 191,354.33 and 81,316.94 is: 112,181.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,706.79 : 191,354.33 = 81,316.94 : x
  2. Step 2: Convert to fraction form
    138,706.79/191,354.33 = 81,316.94/x
  3. Step 3: Cross multiply
    138,706.79x = 191,354.33 × 81,316.94
  4. Step 4: Simplify right side
    138,706.79x = 15,560,347,817.87
  5. Step 5: Solve for x
    x = 15,560,347,817.87/138,706.79
  6. Step 6: Final answer
    x = 112,181.59

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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.