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Finding the Fourth Proportional to 288.97, 398.72 and 219.00

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Solution

The fourth proportional to 288.97, 398.72 and 219.00 is: 302.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.97 : 398.72 = 219.00 : x
  2. Step 2: Convert to fraction form
    288.97/398.72 = 219.00/x
  3. Step 3: Cross multiply
    288.97x = 398.72 × 219.00
  4. Step 4: Simplify right side
    288.97x = 87,321.72
  5. Step 5: Solve for x
    x = 87,321.72/288.97
  6. Step 6: Final answer
    x = 302.19

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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.