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Finding the Fourth Proportional to 76,199.78, 105,356.36 and 66,741.21

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Solution

The fourth proportional to 76,199.78, 105,356.36 and 66,741.21 is: 92,278.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,199.78 : 105,356.36 = 66,741.21 : x
  2. Step 2: Convert to fraction form
    76,199.78/105,356.36 = 66,741.21/x
  3. Step 3: Cross multiply
    76,199.78x = 105,356.36 × 66,741.21
  4. Step 4: Simplify right side
    76,199.78x = 7,031,611,114.45
  5. Step 5: Solve for x
    x = 7,031,611,114.45/76,199.78
  6. Step 6: Final answer
    x = 92,278.62

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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.