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Finding the Fourth Proportional to 223.80, 308.88 and 209.16

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Solution

The fourth proportional to 223.80, 308.88 and 209.16 is: 288.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    223.80 : 308.88 = 209.16 : x
  2. Step 2: Convert to fraction form
    223.80/308.88 = 209.16/x
  3. Step 3: Cross multiply
    223.80x = 308.88 × 209.16
  4. Step 4: Simplify right side
    223.80x = 64,605.34
  5. Step 5: Solve for x
    x = 64,605.34/223.80
  6. Step 6: Final answer
    x = 288.67

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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.