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Finding the Fourth Proportional to 404.88, 558.32 and 306.86

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Solution

The fourth proportional to 404.88, 558.32 and 306.86 is: 423.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    404.88 : 558.32 = 306.86 : x
  2. Step 2: Convert to fraction form
    404.88/558.32 = 306.86/x
  3. Step 3: Cross multiply
    404.88x = 558.32 × 306.86
  4. Step 4: Simplify right side
    404.88x = 171,326.08
  5. Step 5: Solve for x
    x = 171,326.08/404.88
  6. Step 6: Final answer
    x = 423.15

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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.