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Finding the Fourth Proportional to 278.24, 417.08 and 209.28

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Solution

The fourth proportional to 278.24, 417.08 and 209.28 is: 313.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.24 : 417.08 = 209.28 : x
  2. Step 2: Convert to fraction form
    278.24/417.08 = 209.28/x
  3. Step 3: Cross multiply
    278.24x = 417.08 × 209.28
  4. Step 4: Simplify right side
    278.24x = 87,286.50
  5. Step 5: Solve for x
    x = 87,286.50/278.24
  6. Step 6: Final answer
    x = 313.71

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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.