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Finding the Fourth Proportional to 421.76, 632.72 and 178.40

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Solution

The fourth proportional to 421.76, 632.72 and 178.40 is: 267.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.76 : 632.72 = 178.40 : x
  2. Step 2: Convert to fraction form
    421.76/632.72 = 178.40/x
  3. Step 3: Cross multiply
    421.76x = 632.72 × 178.40
  4. Step 4: Simplify right side
    421.76x = 112,877.25
  5. Step 5: Solve for x
    x = 112,877.25/421.76
  6. Step 6: Final answer
    x = 267.63

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