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Finding the Fourth Proportional to 288.06, 397.28 and 216.86

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Solution

The fourth proportional to 288.06, 397.28 and 216.86 is: 299.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.06 : 397.28 = 216.86 : x
  2. Step 2: Convert to fraction form
    288.06/397.28 = 216.86/x
  3. Step 3: Cross multiply
    288.06x = 397.28 × 216.86
  4. Step 4: Simplify right side
    288.06x = 86,151.07
  5. Step 5: Solve for x
    x = 86,151.07/288.06
  6. Step 6: Final answer
    x = 299.07

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.