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Finding the Fourth Proportional to 6,345.81, 9,518.49 and 1,665.78

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Solution

The fourth proportional to 6,345.81, 9,518.49 and 1,665.78 is: 2,498.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,345.81 : 9,518.49 = 1,665.78 : x
  2. Step 2: Convert to fraction form
    6,345.81/9,518.49 = 1,665.78/x
  3. Step 3: Cross multiply
    6,345.81x = 9,518.49 × 1,665.78
  4. Step 4: Simplify right side
    6,345.81x = 15,855,710.27
  5. Step 5: Solve for x
    x = 15,855,710.27/6,345.81
  6. Step 6: Final answer
    x = 2,498.61

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