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Finding the Fourth Proportional to 85,986.63, 128,995.11 and 26,807.58

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Solution

The fourth proportional to 85,986.63, 128,995.11 and 26,807.58 is: 40,216.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,986.63 : 128,995.11 = 26,807.58 : x
  2. Step 2: Convert to fraction form
    85,986.63/128,995.11 = 26,807.58/x
  3. Step 3: Cross multiply
    85,986.63x = 128,995.11 × 26,807.58
  4. Step 4: Simplify right side
    85,986.63x = 3,458,046,730.93
  5. Step 5: Solve for x
    x = 3,458,046,730.93/85,986.63
  6. Step 6: Final answer
    x = 40,216.10

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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.