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Finding the Fourth Proportional to 402.24, 603.36 and 209.76

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Solution

The fourth proportional to 402.24, 603.36 and 209.76 is: 314.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    402.24 : 603.36 = 209.76 : x
  2. Step 2: Convert to fraction form
    402.24/603.36 = 209.76/x
  3. Step 3: Cross multiply
    402.24x = 603.36 × 209.76
  4. Step 4: Simplify right side
    402.24x = 126,560.79
  5. Step 5: Solve for x
    x = 126,560.79/402.24
  6. Step 6: Final answer
    x = 314.64

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.