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Finding the Fourth Proportional to 660.04, 909.12 and 485.08

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Solution

The fourth proportional to 660.04, 909.12 and 485.08 is: 668.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.04 : 909.12 = 485.08 : x
  2. Step 2: Convert to fraction form
    660.04/909.12 = 485.08/x
  3. Step 3: Cross multiply
    660.04x = 909.12 × 485.08
  4. Step 4: Simplify right side
    660.04x = 440,995.93
  5. Step 5: Solve for x
    x = 440,995.93/660.04
  6. Step 6: Final answer
    x = 668.14

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