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Finding the Fourth Proportional to 66,618.76, 91,931 and 36,403.60

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Solution

The fourth proportional to 66,618.76, 91,931 and 36,403.60 is: 50,235.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,618.76 : 91,931 = 36,403.60 : x
  2. Step 2: Convert to fraction form
    66,618.76/91,931 = 36,403.60/x
  3. Step 3: Cross multiply
    66,618.76x = 91,931 × 36,403.60
  4. Step 4: Simplify right side
    66,618.76x = 3,346,619,351.60
  5. Step 5: Solve for x
    x = 3,346,619,351.60/66,618.76
  6. Step 6: Final answer
    x = 50,235.39

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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.