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Finding the Fourth Proportional to 153,894.87, 212,383.44 and 85,912.40

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Solution

The fourth proportional to 153,894.87, 212,383.44 and 85,912.40 is: 118,563.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    153,894.87 : 212,383.44 = 85,912.40 : x
  2. Step 2: Convert to fraction form
    153,894.87/212,383.44 = 85,912.40/x
  3. Step 3: Cross multiply
    153,894.87x = 212,383.44 × 85,912.40
  4. Step 4: Simplify right side
    153,894.87x = 18,246,371,581.61
  5. Step 5: Solve for x
    x = 18,246,371,581.61/153,894.87
  6. Step 6: Final answer
    x = 118,563.87

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.