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Finding the Fourth Proportional to 459.16, 688.98 and 215.65

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Solution

The fourth proportional to 459.16, 688.98 and 215.65 is: 323.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    459.16 : 688.98 = 215.65 : x
  2. Step 2: Convert to fraction form
    459.16/688.98 = 215.65/x
  3. Step 3: Cross multiply
    459.16x = 688.98 × 215.65
  4. Step 4: Simplify right side
    459.16x = 148,578.54
  5. Step 5: Solve for x
    x = 148,578.54/459.16
  6. Step 6: Final answer
    x = 323.59

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