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Finding the Fourth Proportional to 457.95, 686.79 and 128.80

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Solution

The fourth proportional to 457.95, 686.79 and 128.80 is: 193.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    457.95 : 686.79 = 128.80 : x
  2. Step 2: Convert to fraction form
    457.95/686.79 = 128.80/x
  3. Step 3: Cross multiply
    457.95x = 686.79 × 128.80
  4. Step 4: Simplify right side
    457.95x = 88,458.55
  5. Step 5: Solve for x
    x = 88,458.55/457.95
  6. Step 6: Final answer
    x = 193.16

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