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Finding the Fourth Proportional to 288.88, 398.72 and 223.28

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Solution

The fourth proportional to 288.88, 398.72 and 223.28 is: 308.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.88 : 398.72 = 223.28 : x
  2. Step 2: Convert to fraction form
    288.88/398.72 = 223.28/x
  3. Step 3: Cross multiply
    288.88x = 398.72 × 223.28
  4. Step 4: Simplify right side
    288.88x = 89,026.20
  5. Step 5: Solve for x
    x = 89,026.20/288.88
  6. Step 6: Final answer
    x = 308.18

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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.