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Finding the Fourth Proportional to 136,311.66, 188,127.78 and 78,191.12

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Solution

The fourth proportional to 136,311.66, 188,127.78 and 78,191.12 is: 107,913.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,311.66 : 188,127.78 = 78,191.12 : x
  2. Step 2: Convert to fraction form
    136,311.66/188,127.78 = 78,191.12/x
  3. Step 3: Cross multiply
    136,311.66x = 188,127.78 × 78,191.12
  4. Step 4: Simplify right side
    136,311.66x = 14,709,921,821.31
  5. Step 5: Solve for x
    x = 14,709,921,821.31/136,311.66
  6. Step 6: Final answer
    x = 107,913.89

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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.