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Finding the Fourth Proportional to 85,384.71, 127,929.42 and 66,415.20

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Solution

The fourth proportional to 85,384.71, 127,929.42 and 66,415.20 is: 99,507.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,384.71 : 127,929.42 = 66,415.20 : x
  2. Step 2: Convert to fraction form
    85,384.71/127,929.42 = 66,415.20/x
  3. Step 3: Cross multiply
    85,384.71x = 127,929.42 × 66,415.20
  4. Step 4: Simplify right side
    85,384.71x = 8,496,458,015.18
  5. Step 5: Solve for x
    x = 8,496,458,015.18/85,384.71
  6. Step 6: Final answer
    x = 99,507.96

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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.