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Finding the Fourth Proportional to 128,538.70, 192,808.05 and 127,663.90

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Solution

The fourth proportional to 128,538.70, 192,808.05 and 127,663.90 is: 191,495.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,538.70 : 192,808.05 = 127,663.90 : x
  2. Step 2: Convert to fraction form
    128,538.70/192,808.05 = 127,663.90/x
  3. Step 3: Cross multiply
    128,538.70x = 192,808.05 × 127,663.90
  4. Step 4: Simplify right side
    128,538.70x = 24,614,627,614.40
  5. Step 5: Solve for x
    x = 24,614,627,614.40/128,538.70
  6. Step 6: Final answer
    x = 191,495.85

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.