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Finding the Fourth Proportional to 156,638.40, 216,161.40 and 85,018.42

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Solution

The fourth proportional to 156,638.40, 216,161.40 and 85,018.42 is: 117,325.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    156,638.40 : 216,161.40 = 85,018.42 : x
  2. Step 2: Convert to fraction form
    156,638.40/216,161.40 = 85,018.42/x
  3. Step 3: Cross multiply
    156,638.40x = 216,161.40 × 85,018.42
  4. Step 4: Simplify right side
    156,638.40x = 18,377,700,500.28
  5. Step 5: Solve for x
    x = 18,377,700,500.28/156,638.40
  6. Step 6: Final answer
    x = 117,325.64

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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.