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Finding the Fourth Proportional to 657.78, 985.86 and 475.80

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Solution

The fourth proportional to 657.78, 985.86 and 475.80 is: 713.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    657.78 : 985.86 = 475.80 : x
  2. Step 2: Convert to fraction form
    657.78/985.86 = 475.80/x
  3. Step 3: Cross multiply
    657.78x = 985.86 × 475.80
  4. Step 4: Simplify right side
    657.78x = 469,072.19
  5. Step 5: Solve for x
    x = 469,072.19/657.78
  6. Step 6: Final answer
    x = 713.11

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