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Finding the Fourth Proportional to 111,905.80, 154,429.60 and 61,604.80

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Solution

The fourth proportional to 111,905.80, 154,429.60 and 61,604.80 is: 85,014.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,905.80 : 154,429.60 = 61,604.80 : x
  2. Step 2: Convert to fraction form
    111,905.80/154,429.60 = 61,604.80/x
  3. Step 3: Cross multiply
    111,905.80x = 154,429.60 × 61,604.80
  4. Step 4: Simplify right side
    111,905.80x = 9,513,604,622.08
  5. Step 5: Solve for x
    x = 9,513,604,622.08/111,905.80
  6. Step 6: Final answer
    x = 85,014.40

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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.