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Finding the Fourth Proportional to 85,701.66, 128,601.71 and 66,929.00

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Solution

The fourth proportional to 85,701.66, 128,601.71 and 66,929.00 is: 100,431.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,701.66 : 128,601.71 = 66,929.00 : x
  2. Step 2: Convert to fraction form
    85,701.66/128,601.71 = 66,929.00/x
  3. Step 3: Cross multiply
    85,701.66x = 128,601.71 × 66,929.00
  4. Step 4: Simplify right side
    85,701.66x = 8,607,183,121.92
  5. Step 5: Solve for x
    x = 8,607,183,121.92/85,701.66
  6. Step 6: Final answer
    x = 100,431.93

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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.