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Finding the Fourth Proportional to 312.15, 430.80 and 172.29

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Solution

The fourth proportional to 312.15, 430.80 and 172.29 is: 237.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.15 : 430.80 = 172.29 : x
  2. Step 2: Convert to fraction form
    312.15/430.80 = 172.29/x
  3. Step 3: Cross multiply
    312.15x = 430.80 × 172.29
  4. Step 4: Simplify right side
    312.15x = 74,220.27
  5. Step 5: Solve for x
    x = 74,220.27/312.15
  6. Step 6: Final answer
    x = 237.77

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