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Finding the Fourth Proportional to 85,604.20, 128,415.90 and 26,439.40

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Solution

The fourth proportional to 85,604.20, 128,415.90 and 26,439.40 is: 39,662.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,604.20 : 128,415.90 = 26,439.40 : x
  2. Step 2: Convert to fraction form
    85,604.20/128,415.90 = 26,439.40/x
  3. Step 3: Cross multiply
    85,604.20x = 128,415.90 × 26,439.40
  4. Step 4: Simplify right side
    85,604.20x = 3,395,239,346.46
  5. Step 5: Solve for x
    x = 3,395,239,346.46/85,604.20
  6. Step 6: Final answer
    x = 39,662.07

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.