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Finding the Fourth Proportional to 404.50, 558.48 and 306.78

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Solution

The fourth proportional to 404.50, 558.48 and 306.78 is: 423.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    404.50 : 558.48 = 306.78 : x
  2. Step 2: Convert to fraction form
    404.50/558.48 = 306.78/x
  3. Step 3: Cross multiply
    404.50x = 558.48 × 306.78
  4. Step 4: Simplify right side
    404.50x = 171,330.49
  5. Step 5: Solve for x
    x = 171,330.49/404.50
  6. Step 6: Final answer
    x = 423.56

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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.