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Finding the Fourth Proportional to 288.06, 432.09 and 216.78

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Solution

The fourth proportional to 288.06, 432.09 and 216.78 is: 325.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.06 : 432.09 = 216.78 : x
  2. Step 2: Convert to fraction form
    288.06/432.09 = 216.78/x
  3. Step 3: Cross multiply
    288.06x = 432.09 × 216.78
  4. Step 4: Simplify right side
    288.06x = 93,668.47
  5. Step 5: Solve for x
    x = 93,668.47/288.06
  6. Step 6: Final answer
    x = 325.17

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.