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Finding the Fourth Proportional to 391.13, 587.10 and 305.40

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Solution

The fourth proportional to 391.13, 587.10 and 305.40 is: 458.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.13 : 587.10 = 305.40 : x
  2. Step 2: Convert to fraction form
    391.13/587.10 = 305.40/x
  3. Step 3: Cross multiply
    391.13x = 587.10 × 305.40
  4. Step 4: Simplify right side
    391.13x = 179,300.34
  5. Step 5: Solve for x
    x = 179,300.34/391.13
  6. Step 6: Final answer
    x = 458.42

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