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Finding the Fourth Proportional to 85,999.30, 128,998.95 and 22,819.30

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Solution

The fourth proportional to 85,999.30, 128,998.95 and 22,819.30 is: 34,228.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,999.30 : 128,998.95 = 22,819.30 : x
  2. Step 2: Convert to fraction form
    85,999.30/128,998.95 = 22,819.30/x
  3. Step 3: Cross multiply
    85,999.30x = 128,998.95 × 22,819.30
  4. Step 4: Simplify right side
    85,999.30x = 2,943,665,739.74
  5. Step 5: Solve for x
    x = 2,943,665,739.74/85,999.30
  6. Step 6: Final answer
    x = 34,228.95

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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.