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Finding the Fourth Proportional to 719.61, 990.99 and 686.81

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Solution

The fourth proportional to 719.61, 990.99 and 686.81 is: 945.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    719.61 : 990.99 = 686.81 : x
  2. Step 2: Convert to fraction form
    719.61/990.99 = 686.81/x
  3. Step 3: Cross multiply
    719.61x = 990.99 × 686.81
  4. Step 4: Simplify right side
    719.61x = 680,616.89
  5. Step 5: Solve for x
    x = 680,616.89/719.61
  6. Step 6: Final answer
    x = 945.81

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