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Finding the Fourth Proportional to 661.97, 990.93 and 430.36

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Solution

The fourth proportional to 661.97, 990.93 and 430.36 is: 644.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.97 : 990.93 = 430.36 : x
  2. Step 2: Convert to fraction form
    661.97/990.93 = 430.36/x
  3. Step 3: Cross multiply
    661.97x = 990.93 × 430.36
  4. Step 4: Simplify right side
    661.97x = 426,461.35
  5. Step 5: Solve for x
    x = 426,461.35/661.97
  6. Step 6: Final answer
    x = 644.23

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