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Finding the Fourth Proportional to 390.82, 586.05 and 147.19

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Solution

The fourth proportional to 390.82, 586.05 and 147.19 is: 220.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.82 : 586.05 = 147.19 : x
  2. Step 2: Convert to fraction form
    390.82/586.05 = 147.19/x
  3. Step 3: Cross multiply
    390.82x = 586.05 × 147.19
  4. Step 4: Simplify right side
    390.82x = 86,260.70
  5. Step 5: Solve for x
    x = 86,260.70/390.82
  6. Step 6: Final answer
    x = 220.72

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