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Finding the Fourth Proportional to 278.38, 417.77 and 209.99

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Solution

The fourth proportional to 278.38, 417.77 and 209.99 is: 315.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.38 : 417.77 = 209.99 : x
  2. Step 2: Convert to fraction form
    278.38/417.77 = 209.99/x
  3. Step 3: Cross multiply
    278.38x = 417.77 × 209.99
  4. Step 4: Simplify right side
    278.38x = 87,725.96
  5. Step 5: Solve for x
    x = 87,725.96/278.38
  6. Step 6: Final answer
    x = 315.13

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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.