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Finding the Fourth Proportional to 139,990.53, 193,182.12 and 79,560.12

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Solution

The fourth proportional to 139,990.53, 193,182.12 and 79,560.12 is: 109,790.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,990.53 : 193,182.12 = 79,560.12 : x
  2. Step 2: Convert to fraction form
    139,990.53/193,182.12 = 79,560.12/x
  3. Step 3: Cross multiply
    139,990.53x = 193,182.12 × 79,560.12
  4. Step 4: Simplify right side
    139,990.53x = 15,369,592,649.05
  5. Step 5: Solve for x
    x = 15,369,592,649.05/139,990.53
  6. Step 6: Final answer
    x = 109,790.23

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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.