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Finding the Fourth Proportional to 390.57, 539 and 215.93

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Solution

The fourth proportional to 390.57, 539 and 215.93 is: 297.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.57 : 539 = 215.93 : x
  2. Step 2: Convert to fraction form
    390.57/539 = 215.93/x
  3. Step 3: Cross multiply
    390.57x = 539 × 215.93
  4. Step 4: Simplify right side
    390.57x = 116,386.27
  5. Step 5: Solve for x
    x = 116,386.27/390.57
  6. Step 6: Final answer
    x = 297.99

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