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Finding the Fourth Proportional to 485.88, 728.64 and 139.18

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Solution

The fourth proportional to 485.88, 728.64 and 139.18 is: 208.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.88 : 728.64 = 139.18 : x
  2. Step 2: Convert to fraction form
    485.88/728.64 = 139.18/x
  3. Step 3: Cross multiply
    485.88x = 728.64 × 139.18
  4. Step 4: Simplify right side
    485.88x = 101,412.12
  5. Step 5: Solve for x
    x = 101,412.12/485.88
  6. Step 6: Final answer
    x = 208.72

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