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Finding the Fourth Proportional to 85,400.76, 128,101.14 and 40,999.80

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Solution

The fourth proportional to 85,400.76, 128,101.14 and 40,999.80 is: 61,499.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,400.76 : 128,101.14 = 40,999.80 : x
  2. Step 2: Convert to fraction form
    85,400.76/128,101.14 = 40,999.80/x
  3. Step 3: Cross multiply
    85,400.76x = 128,101.14 × 40,999.80
  4. Step 4: Simplify right side
    85,400.76x = 5,252,121,119.77
  5. Step 5: Solve for x
    x = 5,252,121,119.77/85,400.76
  6. Step 6: Final answer
    x = 61,499.70

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Half scale
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Double scale
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Similar ratio
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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.