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Finding the Fourth Proportional to 156,391.21, 215,819.66 and 84,771.21

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Solution

The fourth proportional to 156,391.21, 215,819.66 and 84,771.21 is: 116,984.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    156,391.21 : 215,819.66 = 84,771.21 : x
  2. Step 2: Convert to fraction form
    156,391.21/215,819.66 = 84,771.21/x
  3. Step 3: Cross multiply
    156,391.21x = 215,819.66 × 84,771.21
  4. Step 4: Simplify right side
    156,391.21x = 18,295,293,895.83
  5. Step 5: Solve for x
    x = 18,295,293,895.83/156,391.21
  6. Step 6: Final answer
    x = 116,984.16

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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.