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Finding the Fourth Proportional to 421.86, 581.96 and 288.92

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Solution

The fourth proportional to 421.86, 581.96 and 288.92 is: 398.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.86 : 581.96 = 288.92 : x
  2. Step 2: Convert to fraction form
    421.86/581.96 = 288.92/x
  3. Step 3: Cross multiply
    421.86x = 581.96 × 288.92
  4. Step 4: Simplify right side
    421.86x = 168,139.88
  5. Step 5: Solve for x
    x = 168,139.88/421.86
  6. Step 6: Final answer
    x = 398.57

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