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Finding the Fourth Proportional to 66,011.69, 91,101.89 and 36,209.45

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Solution

The fourth proportional to 66,011.69, 91,101.89 and 36,209.45 is: 49,972.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,011.69 : 91,101.89 = 36,209.45 : x
  2. Step 2: Convert to fraction form
    66,011.69/91,101.89 = 36,209.45/x
  3. Step 3: Cross multiply
    66,011.69x = 91,101.89 × 36,209.45
  4. Step 4: Simplify right side
    66,011.69x = 3,298,749,330.86
  5. Step 5: Solve for x
    x = 3,298,749,330.86/66,011.69
  6. Step 6: Final answer
    x = 49,972.20

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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.