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Finding the Fourth Proportional to 218.48, 301.60 and 209.28

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Solution

The fourth proportional to 218.48, 301.60 and 209.28 is: 288.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.48 : 301.60 = 209.28 : x
  2. Step 2: Convert to fraction form
    218.48/301.60 = 209.28/x
  3. Step 3: Cross multiply
    218.48x = 301.60 × 209.28
  4. Step 4: Simplify right side
    218.48x = 63,118.85
  5. Step 5: Solve for x
    x = 63,118.85/218.48
  6. Step 6: Final answer
    x = 288.90

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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.