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Finding the Fourth Proportional to 225.24, 310.80 and 209.76

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Solution

The fourth proportional to 225.24, 310.80 and 209.76 is: 289.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    225.24 : 310.80 = 209.76 : x
  2. Step 2: Convert to fraction form
    225.24/310.80 = 209.76/x
  3. Step 3: Cross multiply
    225.24x = 310.80 × 209.76
  4. Step 4: Simplify right side
    225.24x = 65,193.41
  5. Step 5: Solve for x
    x = 65,193.41/225.24
  6. Step 6: Final answer
    x = 289.44

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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.