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Finding the Fourth Proportional to 328.72, 493.75 and 317.78

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Solution

The fourth proportional to 328.72, 493.75 and 317.78 is: 477.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.72 : 493.75 = 317.78 : x
  2. Step 2: Convert to fraction form
    328.72/493.75 = 317.78/x
  3. Step 3: Cross multiply
    328.72x = 493.75 × 317.78
  4. Step 4: Simplify right side
    328.72x = 156,903.88
  5. Step 5: Solve for x
    x = 156,903.88/328.72
  6. Step 6: Final answer
    x = 477.32

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