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Finding the Fourth Proportional to 390.47, 585.90 and 228.47

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Solution

The fourth proportional to 390.47, 585.90 and 228.47 is: 342.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.47 : 585.90 = 228.47 : x
  2. Step 2: Convert to fraction form
    390.47/585.90 = 228.47/x
  3. Step 3: Cross multiply
    390.47x = 585.90 × 228.47
  4. Step 4: Simplify right side
    390.47x = 133,857.64
  5. Step 5: Solve for x
    x = 133,857.64/390.47
  6. Step 6: Final answer
    x = 342.82

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