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Finding the Fourth Proportional to 85,993.90, 128,938.46 and 38,599.79

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Solution

The fourth proportional to 85,993.90, 128,938.46 and 38,599.79 is: 57,876.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,993.90 : 128,938.46 = 38,599.79 : x
  2. Step 2: Convert to fraction form
    85,993.90/128,938.46 = 38,599.79/x
  3. Step 3: Cross multiply
    85,993.90x = 128,938.46 × 38,599.79
  4. Step 4: Simplify right side
    85,993.90x = 4,976,997,475.07
  5. Step 5: Solve for x
    x = 4,976,997,475.07/85,993.90
  6. Step 6: Final answer
    x = 57,876.17

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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.