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Finding the Fourth Proportional to 720.05, 991.91 and 498.62

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Solution

The fourth proportional to 720.05, 991.91 and 498.62 is: 686.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.05 : 991.91 = 498.62 : x
  2. Step 2: Convert to fraction form
    720.05/991.91 = 498.62/x
  3. Step 3: Cross multiply
    720.05x = 991.91 × 498.62
  4. Step 4: Simplify right side
    720.05x = 494,589.89
  5. Step 5: Solve for x
    x = 494,589.89/720.05
  6. Step 6: Final answer
    x = 686.89

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