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Finding the Fourth Proportional to 85,911.40, 128,867.10 and 36,047.80

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Solution

The fourth proportional to 85,911.40, 128,867.10 and 36,047.80 is: 54,071.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,911.40 : 128,867.10 = 36,047.80 : x
  2. Step 2: Convert to fraction form
    85,911.40/128,867.10 = 36,047.80/x
  3. Step 3: Cross multiply
    85,911.40x = 128,867.10 × 36,047.80
  4. Step 4: Simplify right side
    85,911.40x = 4,645,375,447.38
  5. Step 5: Solve for x
    x = 4,645,375,447.38/85,911.40
  6. Step 6: Final answer
    x = 54,071.70

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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.