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Finding the Fourth Proportional to 156,640.99, 216,158.78 and 85,019.47

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Solution

The fourth proportional to 156,640.99, 216,158.78 and 85,019.47 is: 117,323.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    156,640.99 : 216,158.78 = 85,019.47 : x
  2. Step 2: Convert to fraction form
    156,640.99/216,158.78 = 85,019.47/x
  3. Step 3: Cross multiply
    156,640.99x = 216,158.78 × 85,019.47
  4. Step 4: Simplify right side
    156,640.99x = 18,377,704,911.45
  5. Step 5: Solve for x
    x = 18,377,704,911.45/156,640.99
  6. Step 6: Final answer
    x = 117,323.73

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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.