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Finding the Fourth Proportional to 85,801.60, 128,570.82 and 38,999.80

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Solution

The fourth proportional to 85,801.60, 128,570.82 and 38,999.80 is: 58,439.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,801.60 : 128,570.82 = 38,999.80 : x
  2. Step 2: Convert to fraction form
    85,801.60/128,570.82 = 38,999.80/x
  3. Step 3: Cross multiply
    85,801.60x = 128,570.82 × 38,999.80
  4. Step 4: Simplify right side
    85,801.60x = 5,014,236,265.84
  5. Step 5: Solve for x
    x = 5,014,236,265.84/85,801.60
  6. Step 6: Final answer
    x = 58,439.89

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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.