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Finding the Fourth Proportional to 81,279.78, 112,196.17 and 61,194.90

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Solution

The fourth proportional to 81,279.78, 112,196.17 and 61,194.90 is: 84,471.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,279.78 : 112,196.17 = 61,194.90 : x
  2. Step 2: Convert to fraction form
    81,279.78/112,196.17 = 61,194.90/x
  3. Step 3: Cross multiply
    81,279.78x = 112,196.17 × 61,194.90
  4. Step 4: Simplify right side
    81,279.78x = 6,865,833,403.53
  5. Step 5: Solve for x
    x = 6,865,833,403.53/81,279.78
  6. Step 6: Final answer
    x = 84,471.60

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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.