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Finding the Fourth Proportional to 459.17, 688.98 and 215.66

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Solution

The fourth proportional to 459.17, 688.98 and 215.66 is: 323.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    459.17 : 688.98 = 215.66 : x
  2. Step 2: Convert to fraction form
    459.17/688.98 = 215.66/x
  3. Step 3: Cross multiply
    459.17x = 688.98 × 215.66
  4. Step 4: Simplify right side
    459.17x = 148,585.43
  5. Step 5: Solve for x
    x = 148,585.43/459.17
  6. Step 6: Final answer
    x = 323.60

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