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Finding the Fourth Proportional to 129,191.40, 178,344.60 and 86,243.40

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Solution

The fourth proportional to 129,191.40, 178,344.60 and 86,243.40 is: 119,056.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,191.40 : 178,344.60 = 86,243.40 : x
  2. Step 2: Convert to fraction form
    129,191.40/178,344.60 = 86,243.40/x
  3. Step 3: Cross multiply
    129,191.40x = 178,344.60 × 86,243.40
  4. Step 4: Simplify right side
    129,191.40x = 15,381,044,675.64
  5. Step 5: Solve for x
    x = 15,381,044,675.64/129,191.40
  6. Step 6: Final answer
    x = 119,056.26

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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.