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Finding the Fourth Proportional to 659.12, 988.85 and 385.45

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Solution

The fourth proportional to 659.12, 988.85 and 385.45 is: 578.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    659.12 : 988.85 = 385.45 : x
  2. Step 2: Convert to fraction form
    659.12/988.85 = 385.45/x
  3. Step 3: Cross multiply
    659.12x = 988.85 × 385.45
  4. Step 4: Simplify right side
    659.12x = 381,150.72
  5. Step 5: Solve for x
    x = 381,150.72/659.12
  6. Step 6: Final answer
    x = 578.28

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