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Finding the Fourth Proportional to 85,396.95, 128,092.68 and 38,649.87

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Solution

The fourth proportional to 85,396.95, 128,092.68 and 38,649.87 is: 57,973.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,396.95 : 128,092.68 = 38,649.87 : x
  2. Step 2: Convert to fraction form
    85,396.95/128,092.68 = 38,649.87/x
  3. Step 3: Cross multiply
    85,396.95x = 128,092.68 × 38,649.87
  4. Step 4: Simplify right side
    85,396.95x = 4,950,765,429.95
  5. Step 5: Solve for x
    x = 4,950,765,429.95/85,396.95
  6. Step 6: Final answer
    x = 57,973.56

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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.