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Finding the Fourth Proportional to 586.86, 809.42 and 390.03

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Solution

The fourth proportional to 586.86, 809.42 and 390.03 is: 537.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    586.86 : 809.42 = 390.03 : x
  2. Step 2: Convert to fraction form
    586.86/809.42 = 390.03/x
  3. Step 3: Cross multiply
    586.86x = 809.42 × 390.03
  4. Step 4: Simplify right side
    586.86x = 315,696.13
  5. Step 5: Solve for x
    x = 315,696.13/586.86
  6. Step 6: Final answer
    x = 537.94

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