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Finding the Fourth Proportional to 92,811.21, 128,079.39 and 50,369.64

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Solution

The fourth proportional to 92,811.21, 128,079.39 and 50,369.64 is: 69,510.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    92,811.21 : 128,079.39 = 50,369.64 : x
  2. Step 2: Convert to fraction form
    92,811.21/128,079.39 = 50,369.64/x
  3. Step 3: Cross multiply
    92,811.21x = 128,079.39 × 50,369.64
  4. Step 4: Simplify right side
    92,811.21x = 6,451,312,765.72
  5. Step 5: Solve for x
    x = 6,451,312,765.72/92,811.21
  6. Step 6: Final answer
    x = 69,510.06

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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.